Problem with hd 5700 display

Hello there folks, I've got quite a problem with my graphics card. Like a week ago I installed radeon hd 5700 12.3 drivers for windows 7, few days after I experienced bad fps in Battlefield 3/ Dota2 , so I went back to 12.2. Few days after, out of sudden, my screen went like this: http://i.imgur.com/gv8EG.png , both in games,desktop, simply everywhere .I tried using drivercleaner, using system restore yet nothing helped -unless i went safe boot mode, uninstalled the gfx card Hd 5700 via Windows Device Manager. Then it would flawlessly untill I installed the drivers back again (tried different versions of these drivers). What's the matter, guys? :) Any idea what could help me out?
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More about problem 5700 display
  1. -Couldn't edit original post- My screen is actaully in 50% covered in these black squares if somebody didn't get the screenshot.
  2. Need PC specs.
    Motherboard,
    PSU
    RAM
    CPU
    etc etc.

    Most likely, your PSU is not good enough. But that's just a guess given the lack of info you provided.
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