No, the GPU is not used and i bought it from a reputable seller from amazon brand new. And my motherboard has a Pcie x16 slot so it should support it. And This problem is happening after i unplugged my First Gpu from my system. After that no GPU gives any display on my pc. Speaking of PSU, my cooler master MWE has 550w which is more than enough for a Rx 570. And the thing is when i bought this PC earlier it already had the old Radeon Hd 5450 installed in it which worked flawlessly unltil i plugged it out oneday in frustration. After that neither that GPU worked in my pc nor the new Rx 570, which leads me to believe that its quite unlikely that both of my GPUs have been damaged.