Hi Guys, Not sure if I am posting this in the right place. Apologies if this is the wrong place and could a mod move to the right section. I have recently built a system running Windows 7 64 Bit Home Premium OEM: i5 750 Gigabyte P55A-UD4P Gskill Ripjaws DDR3 2000mhz 2x2gb (4GBRH) HIS Ati 5770 (with new cooler, egg shape) Samsung 1tb F3 TP Link 851N PCI Antec True Power New 650W The problem i am having is during a cold start; the pc will boot up normally. I can log into windows. But after a few mins the pc just locks up (not even BSOD, the screen just becomes a blank empty desktop). I am then forced to do a hard reset. After the hard reset, everything works fine and I cant replicate the issue until the next cold start. So everytime I cold-start my computer (after it has been off for the night) it would crash and I have to hard reset it for it to work without further issues. It is very annoying. I have done a 13hr memtest on the ram with no reported errors. I have the latest bios for the motherboard (F6). Latest graphics drivers (Catalyst 9.12). Everything is stock, and I have not mucked around in the bios with voltages and stuff. Anyone have any ideas?