CPU i7 2600k @ 4.6 1.3761v Mobo ASRock Fatal1ty Z68 Ram Corsair Vengeance 1600mhz 1.5 GPU MSI 970 OC PSU Corsair TX 850w Worked fine for a year, other day it did a boot loop twice and worked fine, then past day or so its turned off mid use completely power off, and wont turn back on at all even after trying it for a few hours. Today it powered up fine, but in the bios I notice the vcore fluctuating a lot now. nothing in event logs, passes an intel burn test successfully. temps are 25-30oc idle and around 45-50 under load. CPU is water cooled and has 5 fans in a coolermaster Haf X. Could this be a psu issue or a motherboard issue? I really cant pinpoint it, and am tempting to purchase a new psu but don't want to waste the cash if its the board. I'm using the system now and its running fine, but still notice the vcore twitching slightly.