Ati Radeon 5770 hdmi problem

Hi, I've run into a problem that would make anyone go crazy. 3 days ago or so my PC was connected via hdmi to my 40" Samsung TV no problem whatsoever. I leave my PC on downloading something then come back 2-3 hours later only to see it unplugged from the wall. Unfortunately this for some reason messed up my hdmi output, im not sure what it is since DVI works fine but hdmi seems to not exist anymore when its connected now, I have no clue what the problem could be. Last night i had disconnected my DVI cable then switched to hdmi and it worked. Put it on hibernate turned it back on and then i got the "No signal message" Back to square one. If anyone has any suggestions or ideas on how to fix this pesky problem please let me know!

You could choose display with Windows options or via your GPU program

@PredatorRules: How would I do that?

Windows Settings > device > project

AMD Catalyst > desktop management/common display tasks/my digital flat panels

@PredatorRules: Those options aren't there :/

Bump. Problem still not fixed and now theres another. My pc turns on and so do the led's, but thats it. Nothing else :/ can anyone help? it was working till i took out the video card and also battery and reinstalled.

looking at your problems i would say your psu need replacement.