we have a client with a custom built computer that she has had for about 5 years now. It has worked great without any problems but lately after a power outage or sometimes (this is what the customer reports i haven't been able to verify this) after a windows shutdown the computer will not power back up properly when turned on. the fans spin up and led lights turn on but there appears to be no post, there is no video or beep either. so to fix the issue you have to unplug the power from the PSU (corsair 750 watt) press the power button to drain any residual power, and i'll also turn off the power switch on the PSU, press the power button again for good measure, and then plug it back in, with the power switch off. then i'll flip it back on, press the power button on the case, and it works just fine. I'm thinking that its either the motherboard or the PSU but I want to be absolutely sure before i recommend any replacement hardware. this computer is used by an elderly woman and carries a very large sentimental value to her as it was built by a family member that died recently, so i want to replace as little hardware as possible. Any suggestions are welcome, I know i had this issue before with a cheap PSU and i replaced it with a corsair PSU exactly the same as the one she has now and i've never had any issues, its been running strong since early 2010, so i wouldn't think it would be the psu, but even corsair isn't perfect, and her computer is on almost 24/7, far more than my gaming rig that my psu went into.
Thank you in advance for any help.