My HD5770 graphics card has a strange problem.

[MarshallGermanotta]

Just a few days ago, I bought a second-hand graphics card on eBay. Yesterday it had a strange problem. I opened my computer in the morning, everything was normal, then I restarted, I found that my discrete graphics card does not output a signal, so I tried to plug the VGA cable into the motherboard integrated display interface, actually have a signal! (However, I did not unplug my discrete graphics card), my discrete graphics card still turns, but there is no signal output. My computer also can't detect this with a discrete graphics card. what should I do? I'm going crazy!

 

[MarshallGermanotta]

I don't know if you can understand this picture, I didn't find the English option.
This picture describes my current general computer parameters, but I still have a graphics card inserted in it, but the computer does not detect it.
The next day, it will be able to boot normally, but you can only boot it once. Once it is restarted, it will become unable to detect the discrete graphics card.

 

[MarshallGermanotta]

Help me here!

 

[P1LGRIM]

Bumping a thread is allowed after waiting at least 24 hours with no more than one bump per day

 

[MarshallGermanotta]

Plz！help me