are you guys sure it can only be my power supply because i unpluged my two cd drives and my 2nd hdd and it ran the same way. but now insted of getting windows blue screens of death my system just crashes...
You'd have to use a monitoring program ( or generally in your BIOS, but you won't be able to check when your CPU when it's at load) and see what your +12v rail is running....if you see it dipping down to 11.5v or even worse then you can assume it is infact the PSU