Screen problem

I have the following problem:
I used to use my just normally.
I haven’t installed something special.
But, after using my pc a little the screen get a bit darker and stay here. (darker than normal).
Answer #1
If you gave a little more detail on the problem I might be able to help.
Answer #2
This could be anything among many things . Anyway, start by checking the monitor’s cable. Disconnect it and check it out. Also, try the monitor on another computer. Do you get the same problem?
Answer #3
Hmmm, I’m gonna do what kernel recommends.
Bliz, tell me specifically what info you need.