Is that a SATA SSD? There might be a SATA mode setting in the BIOS other than boot priority. I once had an OS failed to boot because of wrong SATA mode settings. In my BIOS I can toggle between IDE and AHCI.
It could also be the UEFI settings.
Uefi boot or legacy boot settings, or some other boot order thing, probably a bios setting somewhere.
Google is your friend
Disabled “secure boot” and it works just fine now.
More than ever, some of them even mine with farms of laptops with current gen gpu, crypto is destroying the gpu market right now.
Graphics cards, even used, are outrageously priced and often close to the msrp at release if it’s an upper tier card. Even so once in a while you can find a deal if you’re willing to use something a couple generations old. A few months ago I grabbed a MSI GTX 980 4GD5T Armor for $80.