What's the resolution of the monitor you are using? Typically if you set the resolution higher than the monitor's (or HDTV) resolution you get an "Out of Range" error. However, in a few cases it will attempt to display that resolution, but things will look fuzzy.
I recall my cousin having this issue. He had a 1680x1050 monitor, but he set the resolution to 1920x1200 and everything looked fuzzy. Weird, I though he would get the above error message.