Monitor goes blank

i got problem with my desktop which i just bought couple days ago..when im playing games with high graphic quality, my monitor blink with vertical line on my screen before goes blank..sometimes it goes blank using ati 5770 with i5-750..powered with 550 w..

please help me!!
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More about monitor blank
  1. Which version of catalyst is it running;ATi has been churning out crappy drivers of late that seem to add problems instead of solving them.I've noticed that many people have stable systems with catalyst 10.4, so try to roll back to them.
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