Blurry/fuzzy screen resolution

I have a HP Pavilion p7-1421 desktop.  connected to a Samsung SyncMaster 2494hm 24" monitor.  It was all working fine up untill a few days ago.  The monitor kept switching between different resolutions. The computer would make a sound like somthing was being connected then disconnected to it and the screen would switch back and forth. 
When I go to the resolution settings the display device is supposted to be listed as  'SyncMaster2494' and the resolution should be '1920 x 1080' but the only display device is 'Display device on: VGA' with the correct resolution but it is fuzzy or blurry.
I went to samsung and downloaded the latest driver and it doesn't correct the issue.
I have a AMD Radeon HD 7560D video card, I went to their website and downloaded the current driver but that did not correct the issue either. 
I disconnected the monitor and plugged it into a different computer and the display is fine so I am not sure what to do from here.
Please help

do you think it would help to uninstall then re-install the video card? I have not done that yet, I'm a little hesitant becuase I have not done that for a video card before.

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