You didn't reveal enough details but why not head to dxdiag and limit the refresh rate?
http://tweaks.com/windows/37533/refresh-rate-in-directx-applications/
Your post revealed so little about the OS that I hope you can guess the other fixes.
Bob
So, recently I've had a lot of free time, and some extra cash, so I've been using my computer more and more for gaming, lately however I've been getting a few weird issues.
With SWTOR going free to play, I wanted to try it again, however now anytime I load the game it says "out of range", the game never did this before..Other games have, however usually I can solve it by simply pressing ctrl+alt+del and closing it from the task manager, SWTOR stays 'out of range' even if I shut it off and back on again, forcing me to go into safe mode to remove the game.
The other one, is darksiders. I don't know how to explain it, but I took a picture of what my monitor does, http://i.imgur.com/BuVXv.jpg?1 the sound and everytime still works, and this one I can solve by turning the computer off and back on.
Anyone know the causes of these? video card or monitor going? anything else that might be the issue?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic