Do you guys have this problem?

When you get into certain games ( for me cs ), and you quit after that , you will notice that your monitor will be extremely bright. The monitor being extremely bright can also occur if your computer is old. I tried on my 4 year old computer which was like P3 and when I ran my website on it it looked horrible. But when I run this on my current computer which is so much better and has graphic cards and around 1 gb of ram, it looks incredible. Now my question is, how do I solve this bugging issue? <img>