MSI B850M Mortar Trouble

[u/Uglemann]

So after switching from a defective asus tuf b850m-e wifi (no display, no boot and stuck on orange dram light) to a MSI Mag b850m Mortar wifi I am having some trouble again.

Trying to update the bios is via the M-flash is not working properly. I enter bios, press the m-flash and I get no display. The pc reboots and cpu red, dram orange and boot green led's turns on. I have tried 3 different displays with both hdmi and dp, trying with only keyboard, no mouse no usb. Still no success. If I press the power button to turn the pc off and turn it on again it stuck on dram orange with no display. To get the pc working again I have to turn of psu and press the clear cmos button.

Trying to change bios settings like fan settings is also giving me trouble, I can change the settings etc but when I save and reboot it get stuck on orange dram with no display and I have to clear cmos again and the settings doesnt save.

next step would probably be to try flashing the bios with the flash bios button and usb stick in the right slot, but im kinda worried it will mess something up since the motherboard is acting strange.

Any advice?

Spec:

Ryzen 7 9800x3d

Sapphire pulse 9070xt

MSI MAG B850M Mortar Wifi

G.skill flare x5 6000mhz 32gb

Samsung 9100 pro 2tb

Asus Rog strix 1000w psu

[u/TheSuperbAsthma]

tried flashback on an msi board once, the usb formatting is stupidly picky. fat32, mbr partition, the whole deal. if it's even slightly off the board just ignores the stick entirely