Question Hd 7850 artifacts

Nov 3, 2019
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Hi!
I try to make it short as possible:
I bought an used HD7850 2GB DIRECTCU II.
i installed it in my pc, boot up, but one of the fan didn't spin and it showed some artifacts ( also in bios) and a wrong display resolution.
i asked the seller and he told me that one day he was playing and suddenly the system crashed(caused by overheating) so he put it away and bought another card.
so i decided to change the thermal paste and the fan but it ended up in the same result.
i installed the latest driver but the artifacts during boot persist and i cannot past the loading windows screen because i am getting a black screen.
i think its an hardware problem and i looked more closely to the backplate and i found some strange "discoloration"(it seems to be soldering flux).
i took some photos View: https://imgur.com/a/Tl7Fo5j


can anyone help me?
 

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