So this problem started about two months ago and has slowly gotten worse.
I'll be playing various games on the computer and suddenly the screen will go black. In order to get it to work again, i have to turn the monitor off, wait a little while, then turn it on again. The computer isn't freezing because i can still hear game noise and such, just there is no picture. It seems to happen after the monitor has been on for a long time. The computer and Monitor are about three years old and aren't on warrenty anymore, so i can't get a replacement that way. This problem has never happened before, just started 2 months or so ago, even though i didn't do anything different then (change settings or whatever). It has gotten worse in the last few days, happening more often (as the temperature outside goes up in the spring/summer). So EARLIER today i aimed a FAN at the monitor and it didn't get hot, but the screen still went black. So then i thought it was the video card, so i openned the computer up and aimed another fan on that, keeping it cool. Then the black screen happened again, but even more frequently. I haven't updated the monitor drivers in a while, but it seems more like it is a heating issue. I'm out of ideas on what it could be and how to solve it.
It is a CTL 7Gx Monitor.i dont know of any monitors that overheat, ive never even heard of that before. but maybe thats just me.

neway, the best thing to do is to borrow another monitor and see if that monitor has the same problem. if it does, its either ur video card or it might be some sort of virus.It may be problems other than heat. Try that monitor on another MACHINE, and try another monitor on this machine to determine where the problem is. There are NO user servicable parts in a monitor, so if that is the problem you need to get another.