I am using a Mac Pro Tower, a 2012 refurb with 0sx 10.7.4, and a Samsung Syncmaster monitor. My problem is that Im getting 2in thick black bars on the sides of the screen, and the graphics are all horizontally squished. I've tried adjusting in System Preferences > Displays, but no Resolution looks right. I'm using 1920 x 1080 60 hz, which is what matches the syncmaster, but still it looks wrong. Any ideas on how to fix this?