| imac g5 help needed asap [message #27246] |
Tue, 04 December 2012 15:43  |
jayson skinner
Messages: 1
Registered: December 2012
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i just bought a used 2004 imac g5 desktop and i dont know what to do. hears
my problem. when i plug the power, keyboard and mouse in and press the
power button the screen will either start up with the chime but stay black.
you can kinda, almost not at all, hear something getting power to it. after
about a minute or so you can hear that the fans have started up and are at
full speed. the mouse will light up but the keyboard wont. idk what to do.
i just bought this from a friends friend that said it just needs an os for
it, but idk but any and all help will be greatly appriciated. thanks
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| Re: imac g5 help needed asap [message #27247 is a reply to message #27246] |
Tue, 04 December 2012 16:24  |
Bruce Johnson
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Registered: August 2012
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On Dec 4, 2012, at 1:43 PM, jayson skinner <lilbit.skinner@gmail.com> wrote:
> i just bought a used 2004 imac g5 desktop and i dont know what to do. hears my problem. when i plug the power, keyboard and mouse in and press the power button the screen will either start up with the chime but stay black. you can kinda, almost not at all, hear something getting power to it. after about a minute or so you can hear that the fans have started up and are at full speed. the mouse will light up but the keyboard wont. idk what to do. i just bought this from a friends friend that said it just needs an os for it, but idk but any and all help will be greatly appriciated. thanks
The iMac G5's were built at the height of the Great Capacitor Plague <http://en.wikipedia.org/wiki/Capacitor_plague>.
From the symptoms you describe, some of the caps on the mobo are bad. Basically you need to unsolder a bunch of capacitors on the logic board and the power supply (since you've got it open) and replace them with new, good ones.
Fans going full blast mean the system hasn't booted up enough to engage the onboard temperature controllers which modulate the fans.
Search the archives of this list and the LEM imac list for references to part sets and such.
If the problem was just 'needed an OS' then a white screen with a flashing question mark would come up and the fans wouldn't be going full blast.
It's unlikely to be a bad LCD because the keyboard would light up and the fans would slow down.
--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group
Institutions do not have opinions, merely customs
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| Re: imac g5 help needed asap [message #27248 is a reply to message #27246] |
Tue, 04 December 2012 16:27 |
James Knight
Messages: 18
Registered: November 2012
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It should display something if it is looking for the OS on the HD but doesn't find it. I would recommend these steps:
http://support.apple.com/kb/ts2094
To start. This will help narrow down the culprit.
-Doc Jimbo
Sent from my mobile device.
On Dec 4, 2012, at 3:43 PM, jayson skinner <lilbit.skinner@gmail.com> wrote:
> i just bought a used 2004 imac g5 desktop and i dont know what to do. hears my problem. when i plug the power, keyboard and mouse in and press the power button the screen will either start up with the chime but stay black. you can kinda, almost not at all, hear something getting power to it. after about a minute or so you can hear that the fans have started up and are at full speed. the mouse will light up but the keyboard wont. idk what to do. i just bought this from a friends friend that said it just needs an os for it, but idk but any and all help will be greatly appriciated. thanks
> --
> 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.
> The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
> To post to this group, send email to g3-5-list@googlegroups.com
> For more options, visit this group at http://groups.google.com/group/g3-5-list
--
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| Re: imac g5 help needed asap [message #27249 is a reply to message #27247] |
Tue, 04 December 2012 16:55 |
Kris Tilford
Messages: 133
Registered: August 2012
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On Dec 4, 2012, at 3:24 PM, Bruce Johnson wrote:
> From the symptoms you describe, some of the caps on the mobo are bad.
Agreed, bad caps.
You can visually check for "popped" caps on the motherboard. Here's
what popped caps look like:
<http://c.fixya.net/fixya20/uploads/Images/C2F85BA.jpg>
Here's disassembly instructions to get access:
< http://www.powerbookmedic.com/wordpress/2010/04/06/imac-g5-r epair-guide-teardown-released
>
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| Re: imac g5 help needed asap [message #27417 is a reply to message #27246] |
Wed, 05 December 2012 19:57 |
tina
Messages: 19
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Den Tirsdag, 4/12 2012, 09:43, jayson skinner skrev:
> i just bought a used 2004 imac g5 desktop and i dont know what to do.
> hears
> my problem. when i plug the power, keyboard and mouse in and press the
> power button the screen will either start up with the chime but stay
> black.
> you can kinda, almost not at all, hear something getting power to it.
> after
> about a minute or so you can hear that the fans have started up and are at
> full speed. the mouse will light up but the keyboard wont. idk what to do.
> i just bought this from a friends friend that said it just needs an os for
> it, but idk but any and all help will be greatly appriciated. thanks
FWIW ?
i had one behave exactly like this when I tried to boot it from a cd, and
with no memory and harddrive installed
good luck
/tina
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| Re: imac g5 help needed asap [message #27418 is a reply to message #27417] |
Wed, 05 December 2012 20:03 |
tina
Messages: 19
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Den Torsdag, 6/12 2012, 01:57, tina@nehaia.dk skrev:
> Den Tirsdag, 4/12 2012, 09:43, jayson skinner skrev:
>> i just bought a used 2004 imac g5 desktop and i dont know what to do.
>> hears
>> my problem. when i plug the power, keyboard and mouse in and press the
>> power button the screen will either start up with the chime but stay
>> black.
>> you can kinda, almost not at all, hear something getting power to it.
>> after
>> about a minute or so you can hear that the fans have started up and are
>> at
>> full speed. the mouse will light up but the keyboard wont. idk what to
>> do.
>> i just bought this from a friends friend that said it just needs an os
>> for
>> it, but idk but any and all help will be greatly appriciated. thanks
>
> FWIW ?
>
> i had one behave exactly like this when I tried to boot it from a cd, and
> with no memory and harddrive installed
>
> good luck
>
> /tina
correstion: tried to boot from a dvd
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| Re: imac g5 help needed asap [message #27419 is a reply to message #27417] |
Wed, 05 December 2012 20:05 |
Valter Prahlad
Messages: 87
Registered: September 2012
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Il giorno 06/12/12 01:57, tina@nehaia.dk ha scritto:
> i had one behave exactly like this when I tried to boot it from a cd, and
> with no memory and harddrive installed
AFAIK, with no memory the Mac should "beep" one time
(see http://support.apple.com/kb/HT1547 )
and do not chime (like the OP's Mac did).
BTW, did you think your Mac could boot without memory? :-)
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| Re: imac g5 help needed asap [message #27420 is a reply to message #27418] |
Wed, 05 December 2012 20:12 |
Kris Tilford
Messages: 133
Registered: August 2012
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On Dec 5, 2012, at 7:03 PM, tina@nehaia.dk wrote:
>> i had one behave exactly like this when I tried to boot it from a
>> cd, and
>> with no memory and harddrive installed.
No, your memory must be wrong. He said it "chimed" when he pressed the
power button, the chime is the audio confirmation of the system self-
check and this means that there's RAM installed that has checked out
"OK". If there was no RAM, you'd hear an error "beep" sequence instead
of the chime.
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| Re: imac g5 help needed asap [message #27539 is a reply to message #27419] |
Fri, 07 December 2012 04:54 |
tina
Messages: 19
Registered: December 2012
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Den Torsdag, 6/12 2012, 02:05, Valter Prahlad skrev:
> Il giorno 06/12/12 01:57, tina@nehaia.dk ha scritto:
>
>> i had one behave exactly like this when I tried to boot it from a cd,
>> and
>> with no memory and harddrive installed
>
> AFAIK, with no memory the Mac should "beep" one time
> (see http://support.apple.com/kb/HT1547 )
> and do not chime (like the OP's Mac did).
>
> BTW, did you think your Mac could boot without memory? :-)
>
he-he, no I didn't think so - I didn't know
I got it for free with the message that the power supply was dead and the
harddrive was pulled
so, after replacing the power supply, I obviously thought I could boot it
from a system dvd
sorry, I can't remember if there were beeps or chimes, but the fans came
on full speed and scared the s... out of me
/tina
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| Re: imac g5 help needed asap [message #27916 is a reply to message #27539] |
Sat, 08 December 2012 03:00 |
JHPArizona
Messages: 4
Registered: October 2012
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On Friday, December 7, 2012 2:54:55 AM UTC-7, Tina Holm wrote:
>
> Den Torsdag, 6/12 2012, 02:05, Valter Prahlad skrev:
>> Il giorno 06/12/12 01:57, ti...@nehaia.dk <javascript:> ha scritto:
>>
>>> i had one behave exactly like this when I tried to boot it from a cd,
>>> and
>>> with no memory and harddrive installed
>>
>> AFAIK, with no memory the Mac should "beep" one time
>> (see http://support.apple.com/kb/HT1547 )
>> and do not chime (like the OP's Mac did).
>>
>> BTW, did you think your Mac could boot without memory? :-)
>>
>
> he-he, no I didn't think so - I didn't know
>
> I got it for free with the message that the power supply was dead and the
> harddrive was pulled
>
> so, after replacing the power supply, I obviously thought I could boot it
> from a system dvd
>
> sorry, I can't remember if there were beeps or chimes, but the fans came
> on full speed and scared the s... out of me
>
> /tina
>
>
Check the Capacitors as suggested above. Once you get a display you work on
getting an OS installed if you have a HDD installed.
--
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