I have a my gaming rig that is under a year old. Motherboard is the sabertooth 990fx. I have a AMD 9590 with a self contained water cooler. When i start up my pc it'll be fine for the first 20-30 minutes. then it'll lock up and i have to restart it. when i go to restart it'll start the Post test but will turn off again. when i initally looked this up i was told it was the power supply which i swapped out. Still having the wrong problem. wondering if its the processor or the motherboard. any help would be appreciated bang head