First thing to check is the connection on back of the computer. Wiggle the cable where it plugs into the video card, if it turns white again there's your problem. Bad connection. I have one that does the same, have to wiggle it every couple of weeks and it's fine for a while.
If that's not it, it's probably one of the color tubes inside the monitor saying bye bye. Only fix for that is to buy another monitor.
If at first you don't succeed, skydiving is not for you!
Note: Please post your questions on the forums, not in my email.
Computer Information Links