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Black screen after 5min. of playing

Last response: in Graphics & Displays
December 12, 2012 6:48:51 PM

hello, i have a problem with my gygabyte radeon 5770. When i play HD game like nfs hot pursuit or shaun white skateboarding they all turn into vertical grey lines or black screen after 5 minutes of playing. and there is no overheating :(  I've tried to clean all dust, changed therminal paste. my psu is 400W, But before i had no problem of playing those games. and now suddendly BLACK SCREEN. BTW. music plays for a while and then hangs and repeats about 1sec. over and over again. PLEASE HELP i hate this i'm trying to solve this *** almost half year

p.s my drivers are fully updated

AMD phenom II X4 920 2.8ghz
2 gb ram
400W PSU
gygabyte radeon hd 5770
500gb HDD
a b U Graphics card
December 12, 2012 10:14:37 PM

have you tried looking for the last firmware of the card? that can fix several problems.
a b U Graphics card
December 12, 2012 10:38:10 PM

Update windows. remove gpu then insert that correctly. download and install "gamebooster"freeware.To boost ur system.