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Ok i have always wanted to do this but whenever it never works as planed

well whenever i plug my PC directly into my HDTV through a DVI cable i get a picture but everything is very blury and it dosent show the whole screen as a move to the edge of the HDTV with my cursor the screen scrools?
anyone know of how i can fix this

NOTE: I have 2 NVIDIA 6800Ultras (SLI) and the newses drivers for it and i noticed that in the driver update it says

TV-Out/HD-out support for NVIDIA SLI.

Also 1 other thing since i have 4 DVI ports on my pc (2 for each GFX card) could i have my PC moniter and my HDTV hooked up at the same time?

any help would be great!

ok well im totally lost dose any 1 have any ideas some 1 plz reply plz let me kno there are ppl out there!