ASUS ROG Strix B550-I won't POST and cannot enter bios

[adnan_u]

Hi all,

Hoping someone can help me? I have the above mentioned motherboard which is currently failing to POST. PC boots up to the ROG logo and remains there with the green QLED lit constantly. Pressing F2 and/or Del keys to enter the bios have no effect. I have tried using Flashback to flash the latest ASUS firmware for this board, this results in an fTPM nv corrupted message and pressing Y or N here restarts the PC putting me back where I started.

I have managed to dump the winbond (w25q256jw18) bios chip using a CH341A chip reader but haven't attempted a manual reflash yet (from what I can tell the flashbacks did work). Is there some way to reset the bios to factory settings manually? Is it just a case of extracting the bios file from the ASUS firmware cap file?

Any help would be appreciated.

Thanks.

[McWhitePink]

Did you try to remove your hard drive and boot? before saying anything is dead, you may need to try everything to get into the bios settings

[adnan_u]

Yes, I have removed the SSD and swapped out the RAM, but still get the same result. I also tried disconnecting the CMOS battery/shorting the CLEAR_CMOS pins but this did not work either. Unless anyone can think of anything else I'm going to probably try a manual flash of the bios and see if that does anything useful.

[adnan_u]

An update on this... I used UEFITool to extract the main bin file. I then attempted to use FD44Editor to update the MAC and Motherboard SN but I could not get the app to save my changes, ended up resorting to using HxD to search my original bios dump for these values and block copy them across to the extracted bin file starting at the same offsets and saving this to a new file. Reopened the new file in FD44Editor and the values appear to have stuck correctly! I then attempted an erase and flash with the new modded bios using NeoProgrammer and a WSON8 pogo adapter, this seemed to work but I could not verify the flash, I read back the bios image I wrote to the chip and compared it to the one I attempted to flash. They didn't appear to be the same (FD44Editor identified the new version though). Figured I would try to boot anyway but the board still won't POST. Ended up using Flashback to revert to a stock image for now. I'm stuck here same Green boot QLED logo, going to try disconnecting the CMOS battery and shorting the pins again, but I've pretty much run out of ideas, I feel like this board is repairable but the l am the limiting factor here If anyone can suggest more things to try please do it would be good to understand what has gone wrong.