I overclocked my Q9550 from 2.83 to 3.80 @1.25 volts. I ran memtest 4.1 ( Test 1 to 5), they all passed without any errors (As per memtest guide, tests 1-4 are to test stability of CPU and Voltage). My Rams are on default config, except my motherboard underclocks them to 1591 instead of 1600, due to 1790 FSB of the CPU. For the life of me I can't understand why I am not able to understand whenever I try to install Win 7 x64, It hangs on starting 'Windows Screen'. Please help me guys.
Did you install Windows on this machine ?( i mean you didnt install it on the HDD on another machine and placed in on this one). If you didnt, install it on this PC because if you install it on another one you wont install the proper drivers. Ive seen a similar problem and that was the reason Windows hanged on loading screen.