So last night I finally got around to swapping out the power/analog board on a buddy's iMac SE, and got the job done successfully (finishing by about 1 am; ugh. Talk about too little sleep.) So, I fire it up, adjust the brightness & focus, tear it all apart to adjust the placement of the degauss cable (nasty green hues where it should be blue), put it all together again, and all seems happy.
Then it locks up. Hard. Mouse is frozen. This is something I've only seen once or twice in OS X (this one is running 10.2.8.) I restart it, and it freezes as the Finder is coming up. I force another restart, and it doesn't even get that far.
By this time, I've about had it, so I shut it down & go to bed. After we've both had a good long rest, I hit the power button again, and it gets to the point of loading the finder again and throws up the "You must hold the power button to shut down" or whatever it says, in multiple languages, error window. Not good.
I didn't have time to mess with it any further -- gotta earn a living you know -- but it's been bugging me. I'm thinking it could be one of a few things:
Heat -- when reassembling the thing I noticed that the metal plate that the logic board attaches to serves as the heat sink for the processor; is it possible that there isn't sufficient contact between the two that is causing the thing to overheat? Since it booted up and ran fine at first, but even after sitting for several hours it won't boot now, is it possible that it did overheat and damage the processor (700MHz G3)?
OS Problems -- This seems less likely, since it did boot & run fine at first. When it locked up I was trying to fire up System Profiler. Or could a heat-related lockup cause an OS software problem?
Something shook loose inside -- possible I guess, but again it seems strange that it was working fine at first, but now it's not. Hmmm.
Anybody have any idears for me on this? Anything I'm maybe way off base on, or things I can try?