i need help my computer once in a while will randomly shutdown and sometimes also after manually shutting down my computer it will suddenly power on by itself after a couple of mins. i heard it could be a power supply or memory problem im not sure though how to pinpoint the exact problem. is there like a tool or program that i can use to troubleshoot the problem? i have an hp pavillion a6000n that i upgraded with a 750W PSU and evga 8800 gts 640. my last resort is to bring it to a pc technician so any help would be great. thank you