Not sure if anyone can help with this, but I've got a frustrating problem with a PC I just built. Relevant components:
Motherboard - ASUS ROG STRIX B550-F
CPU - AMD Ryzen 9 5900X
RAM - 32 GB (2x16) DDR4 3200
GPU - MSI GeForce RTX 3080 12GB
Storage - 4TB HDD (SATA connected) + 1 TB SSD M.2 connected
PSU - EVGA SuperNOVA 1000GT 1,000 watt
Problem: I assembled everything and turned it on for the first time, it briefly displayed the BIOS screen indicating new CPU detected for about 1/2 second or so, then the screen went blank. The post check lights on the motherboard indicate it pasts post check for VGA, CPU, and DRAM (white, red, and yellow lights turn on then back off) but not the boot device (green light comes on and stays on). I have not been able to get it to actually display anything on my screen with the following troubleshooting configurations, getting the exact same symptoms with each attempt:
HDD SATA connection moved to a different slot, HDD removed entirely (so just SSD), SSD removed (so just HDD), RAM pulled and reseated, just one stick of RAM (tried with each stick), graphics card replaced with the one on my current functional computer, cleared CMOS RAM, and replaced the battery of the CMOS RAM.
I also tried removing the graphics card entirely, which resulted in both the POST check keeping both the white (VGA) and green (boot device) error lights on which was expected.
Is my next step a motherboard swap, or is there something else I can try first?