Windows 7 hangs on startup [PLEASE HELP!!]

Glowbit

Reputable
Jan 3, 2015
69
0
4,630
Hi, I recently installed windows 7 in my new SSD (Samsung 850 evo 250GB) and everything works fine. I get +500mb/s. But sometimes when I boot it freezes. Usually it takes like 10 seconds to boot, but sometimes when windows logo appears it freezes for 20 seconds, the peripherals shutdown and the AE qcode (Legacy Boot Event) appears on my mobo. After this, windows 7 boots as if nothing had happened. Why does it happen? I reinstalled w7 with only the ssd connected. After this I booted the PC like 10 times and it was working perfectly, no freezes on startup. Then I shutdown the PC and turn it on one hour later, it hung again. I think it's happening since I updated the bios from 2012 version to 2601, and now I can't downgrade it.
AHCI mode is enabled. Is it my SSD faulty? Or the problem is related with the MB? This is driving me crazy...