X670e Steel Legend no post after BIOS 3.01

Build:

X670e Steel Legend motherboard
7800X3D processor
7900GRE Steel Legend gpu
Corsair Titanium DDR5 6000 RAM
RogStrix 850w PSU

Built first PC in 15 years, all went well apart from RGB conflicts and issues. System has been stable and performing for months, and then this morning I had the bright idea to install latest BIOS, 3.01. All I really wanted to do was play some games on my day off, instead I?™ve been fighting with it all day ?¥´

Motherboard, RGB, and case fans power up just fine but doesn?™t make it to post, display goes to standby due to no signal. I?™ve done CMOS resets including battery in case it was xmp after the bios, removed ram sticks, replaced graphics card, removed graphics card and tried to post off the motherboard hdmi port. Nothing works.

On power up, everything fires up and the motherboard red lights are CPU light constantly on, and the RAM light flashes slowly 8 times, then does a half flash and nothing else happens. CPU light stays on, fans are on, lights are on, but no one is home ?«£

I can?™t get to another PC to try and get another older BIOS for nearly week. I?™ve even tried to reinstall this BIOS several times and it always appears to complete, but the system never gets to post when turned on.

Any help? Thanks ??

Thanks MrBilll, unfortunately I can?™t set anything as I?™ve got no display or post.

I?™ve just got hold of a copy of the previous bios so I?™m just flashing it on now and hoping for good fortune ?”®

Ok I tried the 2.1 BIOS and no effect.

ASRock told me to try different display cable without GPU installed else it?™s either CPU or Motherboard RMA - of course I bought from 2 different vendors to make my life hard.

I?™m going to get a copy of 1.28 or 1.30 BIOS and try that tonight and see if it can just get me in to the BIOS update. Anything displayed on the screen would be a success right now ??