so a little while ago my cousin was gifted a gpu. a chinese rx 580 to be exact after a little while he told me that he's pc was misbehaving and BSOD a lot so when i went to take a look at it, i noticed it may be the gpu so i told him i was going to take it to check it out and inspect it. when i got it home i opened it up cuz i thought it might've been maybe overheating due to old thermal paste, to my surprise it had thermal paste but all the thermal pads were gone so i ordered new ones and after installing them nothing. no post screen, no beep nothing. so how do i know if its dead or im missing something i havent checked?