Asus UX 501V laptop, formerly ran Window 10 until it started to boot into the BIOS screen, which it now does on every power up.

Depending on BIOS settings, I can get it to recognize an external USB DVD reader; so I tried to have it boot from a Win 10 install/repair disk. No joy. The DVD reader seems to be accessed briefly at restart, but the computer still boots directly to the BIOS settings.

I replaced the SSD; that hasn't helped, though the BIOS does recognize it.

NVMe controller and Drive information shows BUS: 3D Dev:0 Func:0 and properly lists the drive manufacturer and size: Kingston SNV3S1000G, 1000.2GB

On advice found elsewhere I've disabled Secure Boot Control and enabled Launch CSM (not the defaults but the defaults weren't working either.)

Legacy boot device support is enabled.

All I can come up with is some kind of disk controller issue that allows it to recognize but not use any attached drives, but that's sheer ignorant speculation, TBH.

It's sort of ancient in computer years. I don't recall exactly when I bought it, but the docs are copyrighted 2015 and the downloaded PDFs of them are file-dated 2016. So ten-ish years.

Any ideas? Luckily, there's nothing critical on the computer, it's not part of my normal workflow. If the best advice is "Scrap it and move on" I'm ok with that. Lord knows, I've spent more time fiddling with this problem than I'd normally spend USING the computer in an average month.

TIA