Alright so I'm not really sure how this began but it's finally getting on my nerves. I have two monitors, one is a 27" widescreen and the other a standard 20" 4:3. Though I doubt the size has much to do with it. I'm having a problem where the picture isn't filling all the space of the monitor. The 27 is also a t.v. so I checked that when any device(PS3, ect.) is plugged in or I'm watching cable the picture fills the screen just fine. I drew a little diagram to try and help explain the problem, the black is the part of the screen that never gets filled when using them screens on the PC. Where normally there should just be the white boxes with no added black space. Also if I try to change the resolution the black area doesn't get bigger or smaller, though the picture stretches beyond the black area so I can't see all of it. If anyone has a clue as to what's going on, anything would be great. Thanks, and if there's more questions I can answer about the problem just let me know.
OS: W7 Ultimate x64
27":1280x720
20": 1280x960
The current resolutions are picked because they allow for the most picture visibility.
Diagram: