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Gigabyte B550 Aorus Pro AC latest BIOS, Vega RX64, 5600X, won’t post, VGA light on… system boots with Ryzen 5 1600.

Threepio

This system was running fine on a B450 D3SH with the 5600X and the Vega 64. I went to take out the garbage, came back to a black screen. 
 

Bios on that was the latest version, tested with an old 7970, wouldn’t post either. Reinstalled my old 1600… it boots fine. 
 

Bought a new B550 board today; got it up and running with the 1600, latest bios confirmed… I installed the 5600X, won’t post. 
 

I reinstalled the 1600 and tried locking the PCI-3 to third generation (hearing that PCI-E 4 might be a problem for the Vega…) still won’t post. 
 

do I need to RMA this 5600x?

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have you reset CMOS? and that's interesting you got a 1600 working in a b550

AMD blackout rig

 

cpu: ryzen 5 3600 @4.4ghz @1.35v

gpu: rx5700xt 2200mhz

ram: vengeance lpx c15 3200mhz

mobo: gigabyte b550 auros pro 

psu: cooler master mwe 650w

case: masterbox mbx520

fans:Noctua industrial 3000rpm x6

 

 

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Yup, pulled the battery for half an hour, shorted the jumper. I tried the Vega RX64 in two out of the three pci slots as well. 

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