Posted 25 November 2009 - 01:44 AM
I'm trying to repair an eMachines T2882 for a friend. It boots up but behaves erratically (mostly very slow, with an alert message popping up about power to the USB device). The strangest part is that when it is turned OFF the light around the power switch blinks orange and there is an audible clicking that accompanies the blinking. It can't be stopped without disconnecting the power.
It sounded like a power supply problem to me, so I tried switching it out: The first one I tried did nothing - no lights, no clicks, no whirs, as though there was no power, but it was a considerably lower wattage PS (150, I think, compared to the 250 that came out of it) so maybe that was the problem? Next I put in a 350W power supply from a working system. It looked great - the light around the power switch glowed green - but when I tried to turn it on nothing happened, and I mean nothing: No fan, no video, nothing but the green glowing light around the power switch.
One might say that the motherboard is bad, but is it not strange that with the original power supply I can boot all the way into Windows XP and use the computer, except for that power alert message and erratic behavior. Then, AFTER I put in the perfectly good power supply from the other computer, the light is no longer blinking orange, but I can't boot up at all? It seems that if the original power supply is bad, then replacing it with a good one should not result in WORSE behavior. On the other hand if the original power supply is good (i.e. not the problem), should it not behave the same when I replace it with another good power supply?
Please help. I'm afraid the original PS was bad and damaged the motherboard somehow and that I'll have to replace both, but that still doesn't quite explain why it would work better with the original bad power supply ... ?