PC won't boot with GPU installed

Hello, everyone,

I hope you guys are doing well. I'm facing an issue with my custom-built PC. The PC won't boot when the graphics card is installed, however, when I remove the GPU, the motherboard loads without issue. I did some troubleshooting, but still to no avail.

Here are some of the steps I've taken:
1. Reseated GPU, CPU, and RAM.
2. Properly secure the power connections.
3. Moved the GPU to a different PCIe slot.
4. Tested the motherboard with a GPU from a working computer (same issue).
5. Removed GPU (which boots)
6. Updated the BIOS/UEFI to the latest version.

Here are the parts for my PC:
- Motherboard: ASRock Z690 PG Velocita
- GPU: Zotac GAMING Trinity OC GeForce RTX 4070 Ti 12 GB
- PSU: be quiet! Pure Power 12 M 1000 W 80+ Gold
- CPU: Intel Core i7-13700K 3.4 GHz 16-Core Processor

I had to perform Flashback BIOS for the CPU, which updated the BIOS/UEFI.

Any help is appreciated!

Sincerely,
NoobBuilder