| G5 Repair - Next step? [message #16272] |
Sun, 16 September 2012 19:46  |
DLC
Messages: 21
Registered: September 2012
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Greetings all,
I'd like to seek advice for those who've tread down the path I need to
take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI
slots) to a small private school. Recently I was told by the teacher that
it just stopped working, so I took it in and ascertained that the video
card was the most likely culprit (issue= boot up chime, then
nothing-nothing fires up, except the fans going full tilt if you wait a
couple minutes, then you need to do a hard shutdown). Apparently not, as a
replacement card (known good) and a 2nd used one I had failed to remedy the
situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery,
returning unit to OEM status, and resetting the board all proved fruitless.
So, I'm inquiring from those in the know what the next step is. Alas, all
keystroke related remedies (resetting PRAM, NVRAM, single user and verbose
mode, C key for optical, etc.) are not an option - the boot-up mode does
not get far enough in to query the peripherals or seek an OS.
I fear it may be bad processor or logic board, but maybe there's a way to
verify or get around?
Many thanks for any input.
Regards,
Dana
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| Re: G5 Repair - Next step? [message #16273 is a reply to message #16272] |
Sun, 16 September 2012 19:56  |
Eric Hall
Messages: 8
Registered: September 2012
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First, I would try to reset the pram:
http://support.apple.com/kb/HT1379?viewlocale=en_US
Then I would try to reset the SMU.
http://support.apple.com/kb/HT1436
Good luck.
Eric
________________________________
From: DLC <dlcatftwin@gmail.com>
To: g3-5-list@googlegroups.com
Sent: Sunday, September 16, 2012 6:46 PM
Subject: G5 Repair - Next step?
Greetings all,
I'd like to seek advice for those who've tread down the path I need to take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI slots) to a small private school. Recently I was told by the teacher that it just stopped working, so I took it in and ascertained that the video card was the most likely culprit (issue= boot up chime, then nothing-nothing fires up, except the fans going full tilt if you wait a couple minutes, then you need to do a hard shutdown). Apparently not, as a replacement card (known good) and a 2nd used one I had failed to remedy the situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery, returning unit to OEM status, and resetting the board all proved fruitless.
So, I'm inquiring from those in the know what the next step is. Alas, all keystroke related remedies (resetting PRAM, NVRAM, single user and verbose mode, C key for optical, etc.) are not an option - the boot-up mode does not get far enough in to query the peripherals or seek an OS.
I fear it may be bad processor or logic board, but maybe there's a way to verify or get around?
Many thanks for any input.
Regards,
Dana
--
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| Re: G5 Repair - Next step? [message #16276 is a reply to message #16272] |
Sun, 16 September 2012 21:12 |
calbert wilson
Messages: 3
Registered: September 2012
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if you having a boot issues it might be the hard drive or software or motherboard
On Sep 16, 2012, at 7:46 PM, DLC wrote:
> Greetings all,
> I'd like to seek advice for those who've tread down the path I need to take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI slots) to a small private school. Recently I was told by the teacher that it just stopped working, so I took it in and ascertained that the video card was the most likely culprit (issue= boot up chime, then nothing-nothing fires up, except the fans going full tilt if you wait a couple minutes, then you need to do a hard shutdown). Apparently not, as a replacement card (known good) and a 2nd used one I had failed to remedy the situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery, returning unit to OEM status, and resetting the board all proved fruitless.
>
> So, I'm inquiring from those in the know what the next step is. Alas, all keystroke related remedies (resetting PRAM, NVRAM, single user and verbose mode, C key for optical, etc.) are not an option - the boot-up mode does not get far enough in to query the peripherals or seek an OS.
> I fear it may be bad processor or logic board, but maybe there's a way to verify or get around?
>
> Many thanks for any input.
> Regards,
> Dana
>
> --
> You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs.
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| Re: G5 Repair - Next step? [message #16287 is a reply to message #16272] |
Sun, 16 September 2012 22:44 |
Bruce Johnson
Messages: 319
Registered: August 2012
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On Sep 16, 2012, at 4:46 PM, DLC wrote:
> Greetings all,
> I'd like to seek advice for those who've tread down the path I need to take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI slots) to a small private school. Recently I was told by the teacher that it just stopped working, so I took it in and ascertained that the video card was the most likely culprit (issue= boot up chime, then nothing-nothing fires up, except the fans going full tilt if you wait a couple minutes, then you need to do a hard shutdown).
Does this one have an Apple Cinema monitor? One professor here had this happen and it turned out to be the power supply on his 23" monitor (which is tied into the video, usb and firewire ports). It was replaced under warrantee, then when a second one went, he made them replace it with the much beefier unit for a 31" and it's worked ever since.
--
Bruce Johnson
"Wherever you go, there you are" B. Banzai, PhD
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| Re: G5 Repair - Next step? [message #16330 is a reply to message #16272] |
Mon, 17 September 2012 08:34 |
DLC
Messages: 21
Registered: September 2012
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Thanks to all who responded. To continue in the hopes of gleaning more
wisdom, here are some clarifications:
1) the computer used a standard VGA-based 17" monitor, though I did try a
spare 15" ADC Apple display to see if it was a port-specific problem on the
video card (no go).
2) As mentioned, I cannot reset the PRAM or NVRAM, as the boot sequence
will not go far enough to query the keyboard or other peripherals (like the
optical drive).
3) I did swap out the HD and put back in the known-good Apple OEM HD, again
no luck, but I can re-attempt with a different HD.
My sad suspicion is the motherboard (first) or processor board, but want to
exhaust all options before I begin parting out the good components.
Many thanks again,
Dana
On Sunday, September 16, 2012 7:46:07 PM UTC-4, DLC wrote:
>
> Greetings all,
> I'd like to seek advice for those who've tread down the path I need to
> take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI
> slots) to a small private school. Recently I was told by the teacher that
> it just stopped working, so I took it in and ascertained that the video
> card was the most likely culprit (issue= boot up chime, then
> nothing-nothing fires up, except the fans going full tilt if you wait a
> couple minutes, then you need to do a hard shutdown). Apparently not, as a
> replacement card (known good) and a 2nd used one I had failed to remedy the
> situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery,
> returning unit to OEM status, and resetting the board all proved fruitless.
>
> So, I'm inquiring from those in the know what the next step is. Alas, all
> keystroke related remedies (resetting PRAM, NVRAM, single user and verbose
> mode, C key for optical, etc.) are not an option - the boot-up mode does
> not get far enough in to query the peripherals or seek an OS.
> I fear it may be bad processor or logic board, but maybe there's a way to
> verify or get around?
>
> Many thanks for any input.
> Regards,
> Dana
>
--
You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs.
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| Re: G5 Repair - Next step? [message #16331 is a reply to message #16272] |
Mon, 17 September 2012 08:37 |
DLC
Messages: 21
Registered: September 2012
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Further info for diagnostic purposes. I ran the unit without the metal
cover on (but left the lucite flow panel in place). I can "manipulate" the
on - off of the fans by removing the lucite panel (and replacing it) while
the unit is on - this I can do within a 2' window - after that the fans
come on full tilt, leaving me with a hard shutdown as an only option for
turning them off.
Hope this helps.
Thanks,
Dana
On Sunday, September 16, 2012 7:46:07 PM UTC-4, DLC wrote:
>
> Greetings all,
> I'd like to seek advice for those who've tread down the path I need to
> take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI
> slots) to a small private school. Recently I was told by the teacher that
> it just stopped working, so I took it in and ascertained that the video
> card was the most likely culprit (issue= boot up chime, then
> nothing-nothing fires up, except the fans going full tilt if you wait a
> couple minutes, then you need to do a hard shutdown). Apparently not, as a
> replacement card (known good) and a 2nd used one I had failed to remedy the
> situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery,
> returning unit to OEM status, and resetting the board all proved fruitless.
>
> So, I'm inquiring from those in the know what the next step is. Alas, all
> keystroke related remedies (resetting PRAM, NVRAM, single user and verbose
> mode, C key for optical, etc.) are not an option - the boot-up mode does
> not get far enough in to query the peripherals or seek an OS.
> I fear it may be bad processor or logic board, but maybe there's a way to
> verify or get around?
>
> Many thanks for any input.
> Regards,
> Dana
>
--
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| Re: G5 Repair - Next step? [message #16454 is a reply to message #16272] |
Tue, 18 September 2012 12:19 |
mjoeyoung
Messages: 3
Registered: September 2012
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I had similar symptoms with my Powermac 2.0 DP. After exhausting all the
simpler fixes I was left with power supply, motherboard or CPU. For me,
one of the CPUs was bad. I found this out my flipping the CPUs. I took
both out, and then put CPU 2 in CPU 1 slot and CPU 1 in CPU 2 slot. The
machine then booted showing only one of the CPUs as functional. The
computer worked fine in this setup, though I didn't do any prolonged
testing. I purchased and installed used CPUs from ebay.
The hardest part of working with the CPUs was taking the cover off. Once
the cover is removed, the cooling fins are sharp and you need a long
handled driver to remove the CPU screws To get an idea of what is
involved, here is a breakdown with pictures that I used:
http://g5.bhmm.net/. You would also need to obtain a copy of the Apple
service disk to calibrate the fans.
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| Re: G5 Repair - Next step? [message #16455 is a reply to message #16272] |
Mon, 17 September 2012 03:12 |
Charles Lenington
Messages: 45
Registered: September 2012
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On 9/16/12 6:46 PM, DLC wrote:
> Greetings all,
snip=======
> So, I'm inquiring from those in the know what the next step is. Alas,
> all keystroke related remedies (resetting PRAM, NVRAM, single user and
> verbose mode, C key for optical, etc.) are not an option - the boot-up
> mode does not get far enough in to query the peripherals or seek an OS.
> I fear it may be bad processor or logic board, but maybe there's a way
> to verify or get around?
Have you checked for bad capacitors on mother board?
--
The Website your boss doesn't want you to know about!<http://www.sfi4.com/8770421/FREE>
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| Re: G5 Repair - Next step? [message #16787 is a reply to message #16272] |
Fri, 21 September 2012 22:45 |
DLC
Messages: 21
Registered: September 2012
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Greetings all, weighing in after some time. My thanks again for the more
folks who posted providing valuable advice. MJoe Young, great pictures re:
the initial take-apart - this will prove helpful for me when I attempt to
re-seat the logic board, which is one of the service source manual's
suggestions, as Fabian pointed out in his equally helpful note.
Thank you all again - I shal attempt to keep you apprised as the project
progresses (hopefully, that is - let's hope it doesn't devolve!).
Regards,
Dana
On Sunday, September 16, 2012 7:46:07 PM UTC-4, DLC wrote:
>
> Greetings all,
> I'd like to seek advice for those who've tread down the path I need to
> take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI
> slots) to a small private school. Recently I was told by the teacher that
> it just stopped working, so I took it in and ascertained that the video
> card was the most likely culprit (issue= boot up chime, then
> nothing-nothing fires up, except the fans going full tilt if you wait a
> couple minutes, then you need to do a hard shutdown). Apparently not, as a
> replacement card (known good) and a 2nd used one I had failed to remedy the
> situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery,
> returning unit to OEM status, and resetting the board all proved fruitless.
>
> So, I'm inquiring from those in the know what the next step is. Alas, all
> keystroke related remedies (resetting PRAM, NVRAM, single user and verbose
> mode, C key for optical, etc.) are not an option - the boot-up mode does
> not get far enough in to query the peripherals or seek an OS.
> I fear it may be bad processor or logic board, but maybe there's a way to
> verify or get around?
>
> Many thanks for any input.
> Regards,
> Dana
>
--
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| Re: G5 Repair - Next step? [message #16801 is a reply to message #16272] |
Sat, 22 September 2012 00:44 |
DLC
Messages: 21
Registered: September 2012
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Greetings again,
I am now at the CPU stage, and need some clarification, please.
I visited M-Joe Young's suggested website: http://g5.bhmm.net/
and am part 9 of the CPUs. Here are my questions:
1) there are six allen-wrench type screws fastened into standouts (3 per
CPU, 2 facing the back and one on the opposite end). There are four
phillips-head screws in the
middle of the heat sinks (2 per CPU) that are difficult to get at
without a long-necked driver. Near them are two more phillips head screws
(one per CPU) that lay higher than
the initial four (easier to get at, comparably). Do I "only" loosen the
allen-wrench type screws and then lift straight up?
2) Anyone know what size allen wrench to use - I'll have to go get one for
the job.
Thanks much,
Dana
On Sunday, September 16, 2012 7:46:07 PM UTC-4, DLC wrote:
>
> Greetings all,
> I'd like to seek advice for those who've tread down the path I need to
> take. A while back I donated a G5 tower (June 2004 model, 1.8GHz DP w/ PCI
> slots) to a small private school. Recently I was told by the teacher that
> it just stopped working, so I took it in and ascertained that the video
> card was the most likely culprit (issue= boot up chime, then
> nothing-nothing fires up, except the fans going full tilt if you wait a
> couple minutes, then you need to do a hard shutdown). Apparently not, as a
> replacement card (known good) and a 2nd used one I had failed to remedy the
> situation. Re-seating RAM, pulling 3rd party cards, new PRAM battery,
> returning unit to OEM status, and resetting the board all proved fruitless.
>
> So, I'm inquiring from those in the know what the next step is. Alas, all
> keystroke related remedies (resetting PRAM, NVRAM, single user and verbose
> mode, C key for optical, etc.) are not an option - the boot-up mode does
> not get far enough in to query the peripherals or seek an OS.
> I fear it may be bad processor or logic board, but maybe there's a way to
> verify or get around?
>
> Many thanks for any input.
> Regards,
> Dana
>
--
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| Re: G5 Repair - Next step? [message #16970 is a reply to message #16272] |
Sun, 23 September 2012 21:04 |
DLC
Messages: 21
Registered: September 2012
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Thank you for the response, MJoe.
I located the correct allen wrench and was able to do as you
indicated. Turns out there are eight of the screws (4 per CPU) though
the instructions referred to only 6, but all came apart with
surprising ease once the CPUs came off (and they were pretty easy too
once the screws were out of the way.
Found a dislodged case seam screw once the motherboard came off. I was
hoping that this may have been the issue all along (a rogue screw
inadvertently jumper-ing a couple of chips - this did happen to me on
a B+W G3 once before), but, once all put back together, alas,
the unit was none the better, eliciting the same start-up issues. So,
I am stuck with determining if it is a motherboard issue (bad ROM chip
as another suggested) or bad CPUs - any tests I can do?
(Fabian, Google lost your note to me where you copied some diagnostics
from your Apple SSM for me - can you resend?)
Thank you again,
Dana
On Sep 23, 11:03 am, mjoeyoung <mjoeyo...@gmail.com> wrote:
> I just checked my G5. It needs a Torx T10 to loosen the "allen-wrench type
> screws." I'm pretty sure there is no need to touch any of the other
> screws. It only takes a little effort to pull out the CPU once the bolts
> are loosened. If it ends up being a CPU problem I can advise further.
> Good luck, and watch out for the cooling fins!
>
>
>
>
>
>
>
>
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| Re: G5 Repair - Next step? [message #17133 is a reply to message #16970] |
Tue, 25 September 2012 11:40 |
mjoeyoung
Messages: 3
Registered: September 2012
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I want to confirm that you switched CPUs (A in B slot and B in A slot) and
that they were both seated properly when you turned the computer on. If
CPU A is bad and CPU B is good putting CPU B in the A spot and CPU A in the
B spot should allow the computer to boot. Both CPUs (even if one is bad)
need to be installed for the computer to work. When I was fixing my
problem I had both issues (unseated and only one installed).
One of the earlier G5s was able to run with only one CPU installed in a 2
CPU system so you could try that, but I think it was an earlier model to
yours.
Have you replaced the battery? That can be the cause of various issues.
I do not know of any motherboard checks except for visual inspection of bad
capacitors. If the computer is making sounds and the fans eventually go
into wind tunnel mode I would think the power supply is probably okay. The
chance that BOTH processors went bad at the same time seems slim. So, I
would guess logic board.
I fixed mine on a whim just to see if it was possible before getting rid of
it. These computers are so cheap now that it is almost not worth the
time/effort to repair them. This is the store<http://www.electronicscafe.com/> I
purchased my parts from. They also sell on ebay. They have a motherboard
that might work for about $17 and a pair of cpus for $25.
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| Re: G5 Repair - Next step? [message #17269 is a reply to message #17133] |
Wed, 26 September 2012 17:01 |
DLC
Messages: 21
Registered: September 2012
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Hello MJoeYoung,
Thank you for the help and link for prospective parts.
Here is what I did recently:
replaced the PRAM,
swapped the CPUs (A to B, and vs. a vs.)
made sure the CPUs were well-seated.
Of course, having to take apart the G5 (not as bad a project as I
thought), that gave me a chance to reseat everything.
I also inspected the board - no noticeably bad elements, though I
suspect the ROM chip may have gotten fried (I have no actual evidence
to this effect, just a gut feeling based on the way the unit boots up.
Thank you for the link. The motherboard is less in $$ than
anticipated, so, I need to decide to invest a little in the hopes that
it offers the cure, or simply give up and part out the unit.
Thank you again for all your contributions on this project.
Dana
On Sep 25, 11:40 am, mjoeyoung <mjoeyo...@gmail.com> wrote:
> I want to confirm that you switched CPUs (A in B slot and B in A slot) and
> that they were both seated properly when you turned the computer on. If
> CPU A is bad and CPU B is good putting CPU B in the A spot and CPU A in the
> B spot should allow the computer to boot. Both CPUs (even if one is bad)
> need to be installed for the computer to work. When I was fixing my
> problem I had both issues (unseated and only one installed).
>
> One of the earlier G5s was able to run with only one CPU installed in a 2
> CPU system so you could try that, but I think it was an earlier model to
> yours.
>
> Have you replaced the battery? That can be the cause of various issues.
>
> I do not know of any motherboard checks except for visual inspection of bad
> capacitors. If the computer is making sounds and the fans eventually go
> into wind tunnel mode I would think the power supply is probably okay. The
> chance that BOTH processors went bad at the same time seems slim. So, I
> would guess logic board.
>
> I fixed mine on a whim just to see if it was possible before getting rid of
> it. These computers are so cheap now that it is almost not worth the
> time/effort to repair them. This is the store<http://www.electronicscafe.com/> I
> purchased my parts from. They also sell on ebay. They have a motherboard
> that might work for about $17 and a pair of cpus for $25.
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