GPU is working but screen is black and freeze
Suddenly screen became black. I shut down pc and it still the same. I thought it is about Windows(?). I scanned disk and format. I opened in safe mood. I removed the rams, reset the bios but it didn’t help. I thought it is hardware and i attached the video card to second PCI slot. It opened. (It opened after format but, when i install video driver, it became black screen again interestingly.)Both of slots are the same condition. I am thinking it is about motherboard but i am doubtful. Video card defect must be the problem too. Now, the problem is from PCI slots or my video card? How can i test PCl slots? How can i learn video card is defected or not? I have not another video card or motherboard. GPU-z shows me that video card is attached and system information too. Video card is working but it doesn’t display.