I am pritty sure that means its a software issue....i would agree, if it's not too annoying to do while the screen is going crazy, try updates on VIDEO drivers

another thing to try might be to RESET your resolution to something lower or higher depending on where you're starting from.

Um, what video card are you running? I don't think I saw it mentioned at all, and it would be helpful for us if you could post itLike I said, this isn't a completely failsafe method. There are other possible factors that could be accountable here. However, it does make me think this is either a software issue or something related to your graphics card (unless you only have onboard graphics). In any case, I would update your graphics card drivers. And if you have a graphics card that isn't onboard, you should make sure it's properly seated or, like patio suggests, try it in a different computer.

Keep in MIND that the PSU is still a viable possibility, so don't rule it out yet. I'm just trying to take a different APPROACH on the situation.