Somehow switched from uefi to legacy now all my computer will do is say database not found

[Computerilleterate]

Is there a way to fix this or a reverse solution to turn it back to uefi or whatever

 

[gn842a]

There's a physical button on some motherboards (such as ASUS) that will get you into UEFI. You might research your mobo specs and see if that is an option.

There are other weird things....

Some keyboards won't let you enter BIOS or UEFI upon bootup. I encountered this with a company that makes some retro IBM selectric keyboards (they sell for fifty or sixty bucks) for modern desktops. I corresponded with them and they were pretty definitive that they didn't care enough about the issue to modify their product, even though it was a retro specialty thing.

Anyhow extra keyboards is something many of us have so you might try a different one. You might also research alternative commands used for UEFI, on mine I believe there are at least two different keys that you can use to get in.

As a general matter, failure to boot can sometimes be a power supply issue. If you have an inexpensive power supply and messing around with lots of boots, you may have pushed it over the brink. One thing you can do is unplug everything except the mobo and SDD (or HDD) and see if it boots with just those systems. Power supplies are easy to replace and cure (or prevent) a variety of ills. I had a computer that wouldn't boot and it turned out that the brand new psu for some reason didn't like that computer (even though it worked in another one). So if you've been changing more than one component that's something to think about.

It sounds like you're in for a bit of a slog in isolating the problem. Maybe someone here has the genius magic bullet.

Greg N