Suddenly after using the computer for months without probems, the screen will lock up, for a couple seconds and then the screen would turn black and turn back on and everything is normal again. When the screens flash off for that second i hear my case fans slow down for a split second too.
Initially I thought it was memory but the memory test had no issues. Then thought maybe the video card? With the fan slowing down, I am leaning towards my Corsair 850w psu. Had it for about 3 years.