Hi guys I've been experiencing some problems with my pc since last month. A week before I went to the sea it began to freeze randomly(1 or 2 times per day ,expecially when I was surfing the web or playign games, but sometimes also when I was using word). Back from the holidays the problem seemed to have disappeared but 3 days ago my pc restarted to freeze and I experienced some bsod too this time. Sometimes it gave me a bsod and froze during it ( waited 15 min ). When it freeze the speakers emit a buzz and my mouse and keyboard's lights turn off. I tried to format it but it didn't work. After that I followed your guide and until now I : * Updated every driver except the bios one becouse there are different revisions of my motherboard and there is a different update for each one : http://it.gigabyte.com/products/page/mb/ga-p55-us3l_10/overview/ * Used memtest (I made 2 tests in a row to be sure) but it didn't found any problem * About the psu I wasn't sure if it was all ok so here is a screen(SpeedFAN) : * My temps are all fine nothing above 70 Specs : CPU:QuadCore Intel Core i5-750, 2915 MHz (22 x 133) Motherboard: Gigabyte GA-P55-US3L Ram : Corsair XMS3 CMX4GX3M2A1600C9 DDR3-1600 (800 MHz) x 2 GPU : NVIDIA GeForce 9800 GT (1 GB) PSU : How can I check it?