What happened is that I left the computer to defragment over night and left for work but in the morning when I tried to start the computer it got past the post but stopped at after that and could not load the OS, so I restarted the computer thinking that something happened while defraging and I have already had the windows 7 disc in my hand when it failed to post. Then it wouldnt even display anything on the monitor just everything started spinning up and suddenly stopped and went into a loop of restarting. After that I removed everything unplugged everything hard drives, optical drives, front panel connectors and took out the graphics card placed it back in same thing, then took it out again and cleared the cmos, placed the GPU back in and same thing, after about 7-9 restarts(also was switching the ram around) it finnally posted but with one memory module then tried it with 2 it posted without a problem. I would also like to note that I had a mild overclock of 4Ghz on te CPU and no overclock on the GPU. Is this a common issue with sandy bridge boards? Now I amfrom the computer thinkin that I turn it off and doesnt come back on. Also noticed theres a new bios the F3 for my board, I would appreciate some input whether I should flash the bios to that or whether is good or bad.