I have a P4 2.4 ghz pc with 1 gb ram and geforce fx 5200 graphics card. I recently got my motherboard and ram changed as they were not working properly.After that, my pc is working smoothly without any problems, but this one! After i run my pc for about 2-3 hrs., if i then shutdown it, and try to turn it on again after around 2-4 hrs. using the power on button on cabinet, it does not turns on. No response on the push of button happens. It is only after around 5-6 hrs. of last runtime that the pc can be turned on again.Rest the pc is working ultra fine! Can any0ne help me? Thanks.