Have you tried switching the video outputs of your card. If the AV wizard is running, then it may be directong to the wrong video card output. You may have to switch outputs, and resolutions using the AV Manager wiki document, the most important part is here:
Keys for choosing a connector:
And for the resolution
Keys for choosing a resolution:
I had to use number 5 and number 6 to get it to display properly, from the svideo port on my nvidia card, to my 42" Projection TV.
Hope this helps.