Screen splitting help? possibly video card problem

[cmple]

I have a AMD Radeon HD 6800

This happens when I start playing games, even ones that are somewhat old (Counter Strike Source anybody?).
The screen splits or moves to the side and comes out of the other side.
PICS:

You can see that the start icon is in the middle, like the screen was pushed to the right side and came out of the left.



This happened with a previous monitor, so I changed it and it seemed to solve the issue. It did not happen for a while with the new one, but then started again recently. The only way to restore it is to put the computer to sleep/ restart/ shut down and then turn it back on. I also changed the HDMI cable, but I'm guessing that its not the problem. Assuming that there are no other hardware to replace, other than the video card, then the video card must be the problem.

I appreciate any help given.

ps. I use a windows 7, 64 bit, i7 3.19GHz

[bigBonehead]

What is you screen resolution set to?
Are you getting your Audio through your Monitor?

[cmple]

What is you screen resolution set to?
Are you getting your Audio through your Monitor?

Losing audio happened with the old monitor, though not this one.
The resolution is 1920x1080, and says it is recommended.

[bigBonehead]

What happens when using a DVI cable?