My screen won't display on HDTV, need help!

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Aug 21, 2007
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I have my powerbook DVI adapter attatched to this DVI>HDMi Cable, and plugged into the HDMi input on the back of my tv. My powerbook detects the TV and everything, but it just doesn't show any video.. doesn't make sense to me, my PC works fine with the cable so I know it's not that.. but if anyone has any idea on what it could be please let me know!! I can't figure it out!

connect.jpg


These are the settings on my powerbook right now, i've played around with them but can't seem to get the right combination.

screen.jpg


***update***
it is now working on 640 x 480 but nothing else... any way I can increase dimension without losing video?
 

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