Hey all -
Well, an interesting issue this evening - turned on my beige G3, and wandered away. My flatmate told me that it made a loud bang, and then reset itself. It got as far as the Disk First Aid verification screen, and then stayed there (as I had been in another part of the house, i hadn't clicked 'done' yet.) There was a fairly strong burning smell coming from the computer, so i yoinked the plug and opened up the computer. I checked for anything obviously burned out on the logic board, but nothing was obvious, except a faint smell from the power supply. Thinking this would be the problem, I opened it up and looked for anything burned out - once again, nothing, but there was a faint burnt smell coming from one of the transformers. Seeing as logic was declining to be interviewed, I very tentatively put everything back together, and now I've had the computer running normally for about an hour. Any Ideas?
The only thing I've noticed differently is that the processor is running at 31�C when it normally runs between 21 and 27�C. However, this may be owing to me possibly putting the power supply back together incorrectly - should the fan be sucking air in to the supply or out of it? And if I want to put a fan on top of the processor, does it need to blow air onto the heatsink or suck it away?
As a rule you blow air on to components. Fan exhaust flow is more determinate than intake flow. So the power supply fan should be drawing air from outside and blowing into the computer. A processor fan should blow air onto the processor. If you do the reverse the air it draws in to the processor heatsink is flowing over other components. Since the processor is usually the highest heat source it needs the coolest air for cooling.
Check to make sure your fans are really blowing air. When they fail sometimes they still turn but at a fairly slow speed and they don't move much air. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting
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