Earlier today I was playing some games on my 3+yrs old Alienware 18 laptop. And all of a sudden my display had some error and my screen was full of big zigzag patterns with the colors all messed up. I forced shutdown and restarted and it worked fine. Then later today when I turned in on that same thing happened right after I logged in. Then it happened again while I was looking for a solution online. But after that my laptop won't start. When I try to start it, it makes 1 beep sound lits up a black screen and beeps again after a while. I ran a diagnostic test before this and didn't show any problems.