Hi everyone, got a pre-built system from Overclockers yesterday (http://www.overclockers.co.uk/showproduct.php?prodid=FS-215-OE&groupid=43&catid=2040&subcat=) everything is awesome so far except one small thing that is doing my head in trying to fix 
My display constantly has a very small black border around it, it seems for some reason Windows isn't using the full screen size. The graphics card is a Sapphire Radeon HD7770 which I've got the latest drivers for. After doing some research on Google it seems everyone else who has had this problem has gone on Catalyst Control Centre and reduced the overscan option to 0%. However mine is already on 0%, and I'm still left with this small black border
It's definitely not the monitor as it's doing the same thing when I connect it to my TV (albeit with a slightly bigger border because of the screen size) and I've tried using both HDMI and DVI with the same results. Has anyone got any idea what might be causing this? It's driving me nuts and spoiling my enjoyment of what is otherwise a great system.
I'd add a screenshot but it seems when taking one it just shows the full windows screen and doesn't include the black border. Nothing is ever easy is it!

My display constantly has a very small black border around it, it seems for some reason Windows isn't using the full screen size. The graphics card is a Sapphire Radeon HD7770 which I've got the latest drivers for. After doing some research on Google it seems everyone else who has had this problem has gone on Catalyst Control Centre and reduced the overscan option to 0%. However mine is already on 0%, and I'm still left with this small black border

It's definitely not the monitor as it's doing the same thing when I connect it to my TV (albeit with a slightly bigger border because of the screen size) and I've tried using both HDMI and DVI with the same results. Has anyone got any idea what might be causing this? It's driving me nuts and spoiling my enjoyment of what is otherwise a great system.
I'd add a screenshot but it seems when taking one it just shows the full windows screen and doesn't include the black border. Nothing is ever easy is it!