screen randomly blackens
i have a hp pavillion zd 8000, when i turn it on sometimes the monitor is on and i can get to the desktop menu for like 1-2 seconds then goes black windows runs normaly with a black screen other times the screen does not turn on at all, i managed to get it into bios one time but while in there the screen went black again. me and a mate tried another monitor but didnt know how to switch screen so dont know if that worked or not. please help everyone iv spoke to doesnt know.
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