GPU-Z <---(Picture from gpu-z so you can find the right bios) I bought a 2nd handed card. It turns out it has a custom bios which may cause my black screens. I have days without black screen and sometimes i have a day when i get a blackscreen couldnt find any help about this on forums so i checked my bios out of curiosity and it turned out i have a custom bios. Which i suspect is the reason i get black screens sometimes. Otherwise i have no idea. The only way of getting rid of it is to turn off the computer with the power button and on again . Thanks for your time!