820-4924 Won't boot

[bjf]

I have an 820-4924 that restarts right when the boot progress bar starts. It wasn't liquid-damaged. My guess is some type of bios issue. I'm trying to fix it with my Medusa but when I try putting a new bios on it I don't get any USB drives at the boot menu. When I put the original bios back on, the drives show up again. I haven't used the Medusa a lot with the 820-4924 boards so I'm not as familiar with how they respond. Any ideas?

 

[2informaticos]

I bet original SSD is APFS formated and you've tried no compatible BIOS.
Try first just to clean ME of your board.
If not, then write new BIOS and do fresh install using other internal SSD.
This way will update BIOS to APFS support...

 

[bjf]

You're absolutely right. It happened again with an Air board. It's just that situation where the older computers can't see APFS yet, until you run the installer. Thanks so much.