Recently I built my first rig, I encountered some issues and ended up having to take to to a computer specialist. At first before it started giving me blue screens, my graphics card was displaying full screen (on an old 1366x768 monitor). Shortly after I ended up taking it to a computer specialist. I had them install a second 6870 and more ram. I just got it back and it is running fine except that my graphics cards are not displaying in full screen. My monitor is 1920x1080 and the best I can get is 1000p in hdtv mode (yes not 1080) or 1650x1000 in basic mode which looks really bad.I tried reinstalling the drivers but I don't know whats going on.
Did you try overscan in catalyst control center?
It sounds alot like a problem i had.
When i got my 1080p screen, i couldn't make it to display correctly.
It took me a few days to find out, after even i brought it back to the store.
find enable overscan
move the bar from 100 to something less en back to 100
Problem solved ... for me
I saw it when I was using hdmi, but I couldn't adjust it. it was like washed out so you could see it. I have the same issue in the performance tab I can't alter the clock speeds and such, not sure if that is normal. I'm sure it can be done through bios though
Is it a recent CCC?
In the old one (when i bought mine one year ago) you had to right click on something.
It was really hard to find.
In the newer one it's much more easy to find.
Check all the tabs, in one you will find "enable overscan" and check the box.
Now you can modify the overscan bar.
I can't tell you exactly where it is because i've sold my 5830 and don't have CCC any more.
When i reinstalled windows 7 recently, i had to do the trick again, thus it is not a problem solved by amd and it is worth trying.