Built a PC for my sons 13th yesterday and everything went just fine until I decided to make a few recommended tweaks in the BIOS. Now it wont boot at all and I am getting the red CPU and yellow ram light on the MB.

Build list:

MSI 850 Gaming plus wifi6 MB

32 GB Zenith DDR5 memory kit

ASRock AMD Radeon RX 9070 Steel legend

AMD Ryzen 5 9600X

Thermalright Peerless Assassin 120 cooler

Seasonic focus 750w PSU

Silicon Power PCIE 2tb SSD

Tweaks I made before restart were to enable expo1 and changed curve optimizer to all cores negative with a magnitude of 20.

So far I have attempted to update BIOS with MSI.ROM on fat32 formatted drive with no partition name. Get a white blinking light followed by fans turning on briefly and after that a solid white light. No blinking light indicating update is taking place. I did this with all components including CPU/Memory/Video card removed and still no dice. I used the CMOS clear button and that didnt work either. This morning I removed the CMOS battery for about 10 minutes and that did not work. Ram was in A2/B2 initially. Tried just one stick in B2. I have tried to use Display port and hdmi from 9070 gpu as well as built in.

Any thoughts on what is going on? I ordered a replacement MB but I am just guessing on that. It had worked fine and windows 11 install went smooth etc. I have taken all of the suggested steps I had seen on other threads but nothing seems to work.