Problem with new monitor

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Joined
24 Dec 2010
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12
so my BenQ EW2420 monitor came yesterday and everything works perfectly via VGA cable - with my laptop (HP DV1299ea) open it replicates the screen and when i close my laptop the monitor shows a much higher resolution full screen display.
The problem occurs when connecting via HDMI cable, with the laptop open everythings ok but when i close the laptop the screen changes to a higher resolution but there is an inch thick black border around the display so its not full screen. I cant seem to find anything on this other than it may be something related to ATI catalyst control centre...? Any suggestion?
 
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