One of my computers suddenly died while in use. Basically it just lost power completely. Can't be turned on any more. I've tried following:
1. Switch the power-on and reset power switches on motherboard hoping to see if it's power switch's problem. But reset switch does not turn computer on either.
2. Clean up the whole computer and pray problem just goes away :) Seriously, it's been sitting on carpet for the last couple years and got a lot of dust, might cause short or component failure. Anyway didn't work.
3. Checked and made sure power strip worked (used the same power cable on another power supply and it worked).
4. Disconnected all HDs and modems, adaptors, memory, basically everything except for power switch and connectors to power unit, and still power won't come on.
However, after all these things were done, I noticed that when I push power switch, the CPU fan turns 1/8 turn and stops (I might have overlooked this before), meaning the power is on (I also accidentally shorted the power unit and burned the screwdriver). But why is the power not enough to even drive CPU fan? Is it power unit partial failure or motherboard problem? What should I do before buying new power unit/motherboard/computer?
Thanks much in advance! Will increase points for good advice.