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HP Recommended

Tyrannotaur, you may also look into the possibility that your motherboard could be defective -just a thought.  Here's some useful HP documentation: https://support.hp.com/us-en/document/bph06739

 


HP Recommended

"AMD Ryzen 7 3700x"

Unless I'm mistaken, this processor does not have an integrated graphics part, so normal that the display cannot work with the motherboard connector.
You can verify ..

Unless I'm mistaken, this processor does not have an integrated graphics part, so normal that the display cannot work with the motherboard connector.
You can verify ..
now check the model you are going to buy, if you want to play comfortably, don't buy anything, either

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HP Recommended

Monitor turning on momentarily and then back off is normal behavior and does not indicate a true video signal was received.

 

This is looking more complicated than a bad GPU as both NonSequitur777 and Prométhée suggested.  The Ryzen 7 3700x does not have a graphics when I looked here 

 

You need to verify the card is actually defective and not the power supply or the motherboard.  Can you try your video board in someone else's computer to see if it works?

 

Possibly a fixit shop might test it for you at no charge if you take the card down to them.

 


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