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Odd RTX 3080 behaviour

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I have this Dell RTX 3080 which is dead before, I send it to service and the guy who did the service shows how it repaste and re-thermal pad and fixed the memory problem and shows video if the card running 3dMark Fire Strike 4k stress test and passing. When I got the card it still exhibit similar problems as before, when booting it just shows no display. I got it run once, and when it runs it runs just fine, playing cyberpunk with no problem whatsoever but problem start again when I shut down. I tried forcing the PCIe to run Gen3 only, and disabling iGPU but it still comes out the same. So what is supposed to be the problem? The PSU? or the motherboard? Both GPU and motherboard BIOS has been updated to the latest one.
 
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faulty card gonna act faulty. find another repair guy or get another card

try card on another system and go from there
 
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My first Voodoo 3 3000 AGP literally developed a fault like that! I had to find another used one, it was like it had a bad solder joint, but I didn't see anything broken! It acted like I accidentally fractured a connection. It happened suddenly in 2005, IIRC. (or near there)

Symptom:

The BIOS usually would bleep for a video init failure. 1 long, 3 short bleeps.
 
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