So I've been having an issue for the past year or so where a black line flashes across my monitor and then disappears so fast I can't attempt a screen shot. Sometimes it will happen twice in a row. I have changed from my monitor over to my tv using a different hdmi cable and the issue seemed to have gone away. Then last week while the pc was connected to my tv the screen started freaking out. The picture seemed to tear itself apart, but I could still see my mouse moving through the chaos.
I restarted the computer and the craziness stopped. I have not been able to duplicate this issue since, but when the computer is connected to my monitor (also a tv just a 23") the black line flashes will still happen off and on. I have checked my temps on both my processor and gpu as soon as it happens and the temps are usually 32c or lower. I have also checked the connections inside the tower on just about everything and have made sure the fans are clean.
Sorry for the long post. I'm hoping someone here can tell me something a mass of google searches haven't, or at least point me in the right direction.
gpu: HD radeon 7850 2gb ddr5
processor: i5 dual core
ram: 6gb ddr3
motherboard: 0rv30w p55
(yes I know it's an alienware, I know I should have built my own, it was a gift from my parents years ago and I have been upgrading slowly it's my first gaming rig)