Hello I have an iMac 2006, this model: http://www.everymac.com/systems/apple/imac/specs/imac-core-2-duo-2.0-17-inch-specs.html The display is messed up, so I use an external 1080p display, this one: http://www.viewsonic.com/us/vx2450wm-led.html I use mini-dvi-DVI adaptor and a DVI cable. The problem: 1920 x 1080 screen does not fill the screen, but there are 2,5 cm black bar on the sides. The resolution setting says 1920 x 1080 though so it should be fine. With an old Mac mini (http://www.everymac.com/systems/apple/mac_mini/specs/mac-mini-core-2-duo-1.83-specs.html) it works fine but I don't want to use that one, it's slower than the iMac. Any idea why there is this problem with the iMac? Thanks a lot!!!