I built a computer for my sister about 8 months ago with a s754 sempron cpu and Asrock K8NF4G mobo. About a week and a half ago the computer just switched itself off and went dead. I thought power supply has gone but tested this by using the paperclip trick and it powers up ok. But to be on the safe side I took out the akasa 480w power supply out of the rig in my sig to test but still nothing no fans spin up or lights come on. So I thought must be mobo so sent that back for a replacement and tried 2 more boards since but exactly the same problem. I am now stumped! Excluding that 3 boards may be dead which is extremely unlikely I next thought is it the cpu that has died? Now to the questions:
1 I am testing outside of case and have just the 2 power supply leads, cpu, heatsink, fan and memory installed and am grounding the 2 pins on mobo power supply switch to turn on. This should be ok to test shouldn't it?
2 if cpu is dead will fans still power up?
I am at my wits end with this as my sister is giving me grief everyday.
Please help
Thanks