From: utzoo!decvax!harpo!seismo!uwvax!reid Newsgroups: net.micro.atari Title: Re: CRASH! Article-I.D.: uwvax.743 Posted: Thu Feb 3 12:35:54 1983 Received: Fri Feb 4 07:06:53 1983 References: utzoo.2788 My 800 crashes, too. The same symptoms, usually right after power-up. The screen will flicker in a very uniform way (within each pixel, the same pattern is visible when it flickers). Everything locks up, no keyboard handler, no nothing. I believe it has something to do with corrosion on the contacts between the Operating System and its corresponding slot, or possible with the CPU board and its contacts. I have spent a lot of time cleaning the contacts, but it doesn't seem to make a huge difference. After the unit has been on for quite a while, I guess when I turn it off, it must oxidize much faster, since invariably I have a problem when I turn it on again after letting it sit for a while. I can usually remedy the problem by cleaning off the Operating System contacts. Is there any way to keep this oxidization from occurring???? Glenn Reid