i have a 4870 i use with 2 monitors, it has just recently decided only to work for one and only the 2 from either port. any ideas. also while i can run some games and apps. when i get really intense graphics situation. it start showinf negative images and alot of artifacts
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is it overclocked is any of your other components overclocked? and how old are your parts
It could be overheating, maybe a good cleaning is in order. What temps is it running at?