I am trying to hook up my laptop to HDTV via HDMI cable. When I connect it, I will see the picture on the TV for a second before it changes to a blank black screen (Not a No Signal screen, btw) - When it's extended mode, I know it's supposed to be working because I can move my mouse/windows offscreen, however the tv remains blank. I've tried changing resolutions, etc and nothing has worked.
Laptop - Gateway P-7805u FX
Graphics Card - GEFORCE 9800m gts
TV - Insignia 50 inch LChdtv