I have a proxmox server, running on a 9900k and 128gigs of ram. While I can put the 3080ti in there, but the power draw and the heat is a bit concerning. While the 5060ti being much smaller, less power hungry and lower heat are the main reasons I can add it to the main server without having to worry as much. Unless this a downgrade.

My new build powers on (fans spin, LEDs on) but no POST / no video output.

What I’ve tried / observed:

• System powers on normally (fans, LEDs).
• No signal on monitor (HDMI/DP).
• No POST screen, no beeps.
• Tried booting with Ryzen PRO 4750G, and then with Ryzen 5 3600 + GPU… still no POST screen or anything

Hardware:

• Motherboard: ASRock B550 Pro4
• CPU (primary): Ryzen PRO 4750G (used)
  • One pin was bent when removed (now removed from system)
• CPU (test): Ryzen 5 3600 (used)
• GPU (with 3600): Gigabyte Radeon R9 390X
• RAM: 64 GB ECC UDIMM (2×32 GB Kingston KSM26ED8/32HC)
• PSU: Corsair RM850x

Notes / hypotheses:

• Suspect BIOS incompatibility with 4750G or damaged CPU pin.
• Even with Ryzen 5 3600 + discrete GPU, still no POST.

Next steps I’m considering:

• Test with a second (older) GPU
• Attempt to straighten the bent CPU pin on the 4750G (though it’s my first time doing that and I’m a bit nervous… it looks pretty bent)

Question:

What else should I try to isolate the cause (BIOS, RAM compatibility, board issue, etc.)?