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Trying to fix graphics card

Aug 4, 2018
3 (0.02/day)
I have a broken PowerColor R9 280X that I've been trying to fix for a while now. The original problem was that the GPU just didn't output any video anymore. Infact, the motherboard refuses to post if I try to use the card alone. If I put a second card in my PC for video, I can boot into windows, where the drivers don't recognize it, though it does show up in device manager and GPU-Z (I don't have a screenshot of that right now since the card isn't in my system anymore, but I can get one later if someone wants to see it). Booting into Linux Mint causes it to spit out a whole lot of error messages about the card "not responding" before hanging up. I tried cleaning the card and checking it for physical damage, but there is none. I also re-flashed the BIOS with a known good one two times with no effect. I'm also pretty sure that the GPU is ok, since the card's cooler does warm up when I power the card, so it is doing something.

Is there anything else I can try to fix it?
Nov 20, 2013
3,292 (1.74/day)
Kiev, Ukraine
System Name Evil Midget
Processor i3-6100
Motherboard MSI B150I PRO AC
Cooling Noctua NH-L9i
Memory 2x8GB Kinkston HyperX DDR4-2133 CL14
Video Card(s) EVGA GTX1060 SC 6G
Storage Samsung XP941, Sandisk X400 512GB
Display(s) Samsung U24E590D (4K/UHD)
Case LianLi Q11B
Audio Device(s) Int.
Power Supply SeaSonic 450W 80+ GOLD
Mouse Logitech G503
Keyboard Zalman K500 modded (Gateron brown)
Software Windows 10
May 7, 2018
919 (3.53/day)
System Name I have too many to fit here. (PC / PS4 / PS3 / PS2 / XBOX 360)
Processor 7740x @ 5ghz 1.3v delidded / 6600k 4.5ghz 1.25v/x5650
Motherboard X299 gaming carbon / Z270X gaming 7/Clevo x7200
Cooling alphacool eisbaer 360mm/Silent loop 280mm/Stock
Memory 32gb ddr4 corsair vengance lpx / None yet/4gb ddr3 1333mhz
Video Card(s) Evga gtx 1080 ti ftw3 @ stock + alphacool nexxos gpx / asus 560 ti 1gb/ 460M sli
Storage kingston ssdnow uv400 480gb ssd (os) toshiba x300 6tb (everything else)/ 2tb barracuda/750gb
Display(s) ElectriQ 4k 28" TN 60hz + KG221Q 21.5" 1080p 75hz freesync/1080p 17.3"
Case Corsair Carbide 600c/Be quiet! Dark base 700/Lego pc case/clevo x7200
Audio Device(s) Hyper x cloud revolver s
Power Supply Seasonic snow silent 750w/Be quiet power pro 11 750w
Mouse Mad Catz Rat Pro X
Keyboard Havit gaming keyboard (amazon keyboard+mouse bundle)
Software Windows 10 pro + Kali linux
Benchmark Scores Too many to fit here.