I'm running into some kind of issue on my brand new PC build between my MSI PRO B-650M-A WIFI motherboard and my XFX Radeon RX 7800 XT. Whenever I have the GPU installed in the main PCIe slot, the computer will sit at a black screen and the boot light on the motherboard will never turn on (the other debug lights also don't come on) no matter whether the HDMI/Display Cable is plugged into the GPU or the Motherboard. If I turn the PC off, unplug the GPU from the PCIe slot (leaving cables connected from the PSU), and switch the HDMI cable to the motherboard, the system will load the BIOS perfectly normally. I tested my XFX Radeon RX 7800 XT in another system and had no issues booting in that system, so I know the GPU works. I've also tested another graphics card (An older Asus Nvidia 780Ti) on my new set-up and once again had no issues booting, so I know that my motherboard/CPU/RAM work. It seems to be some type of compatibility issue between the GPU and the motherboard, but I have no idea how to resolve it.

What I've tried without success: - Reseating GPU in the PCIe slot - Checking all cable connections on the PC - Display cable instead of HDMI - Different ports on my monitor/GPU/motherboard - CMOS reset by shorting the relevant prongs with a screwdriver - Switched from daisy-chained PCIe power cables to separate cables - Updated BIOS to most recent version from MSI's website - Tried manually setting the PCIe slots to Gen 3/4 via the BIOS

I'm frankly at a loss as to what to do next. All of the components in this system appear to function perfectly normally, yet it seems like the combination of my system and the GPU just does not boot.

My components: https://uk.pcpartpicker.com/list/RrbPbL Motherboard: MSI PRO B650M-A WIFI GPU: XFX Radeon RX 7800 XT CPU: Ryzen 5 7600X RAM: Silicon Power 32Gb (2x16) Zenith DDR5 6000MHz CL30 PSU: Thermaltake Toughpower GF3 750W

Thank you for your help.