B550 Aorus Elite AX V2 - Won't Pass Post

[Steph81]

I'm building a new system and I can't get the MB to pass the post. I stripped it down to just the MB and at each stage I got the same Beep Codes. I put the proc in another board and the error codes indicated the CPU was bad, so I replaced the the CPU, but I'm still getting the same error, 1-Long, 3-Short. Here's the set up

• B550 Aorus Elite AX V2
• AMD - Ryzen 5 5600X
• AMD - Radon RX 6500 XT
• Corsair - Vengeance LPX 16GB (2x8) 3200 MHz
• Lexar - NM790 NVMe SSD 1TB
• WD - Ultrastar SATA HD 1TB

I don't have the other MB available to test the CPU and now I'm wondering if the Aorus has an issue and is damaging the processor.

I'm open to any suggestion before I replace the MB.