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Grainy Picture on New LED TV

Last response: in Graphics & Displays
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Picked up a new Samsung 40" LED TV last week. 1080p 120hz. Had it hooked up to my Toshiba satellite (w/Radeon HD4200) via HDMI @ 1920x1080 and the picture looked great. yesterday i hooked up my Dell Latitude from work (HD4000 graphics) and of course the screen looked great as well, swtiched back to the toshiba and now the picture is grainy. Resolution is still at 1920x1080 on the laptop. installed latest drivers from AMD. Tried the refresh at 59hz and 60hz. Still looks... weird. Not what it was before. why would this have changed after plugging in my dell? The picture is hard to even look at.

Thanks :) 

More about : grainy picture led

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Well I changed from HDMI 2 to HDMI 1 input on the TV and bam its back to amazing. Must have changed those when i swapped the laptops out. Apparently HDMI 1 has magical powers that HDMI 2 doesn't. Out of curiosity... why are they different? Guess i'll do more troubleshooting next time before posting for help :) 
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