Windows 10 Won't Boot : Should I Try Using The "Run UEFI Application..." ???

[dc7800]

Windows 10 Won't boot up anymore on my computer. Currently, it goes to a black screen with a grub prompt.  Is this a situation where I should use the "Run UEFI Application..." that is part of the BIOS on this machine?

When I try to boot up, I get a black screen with this on it:

Minimal BASH-like editing is supported. for the first word, 
TAB lists possible commands completions.Anywhere else TAB lists 
possible device or file completion 
grub>

This computer had Win 10 on a hard drive and it worked fine. I wanted to install linux, so I took OUT the hard drive with Win 10 on it (so I wouldn't accidentally erase it) and I put in a DIFFERENT hard drive, and installed Linux on that other hard drive.

Linux installed fine. But now when I swap my original hard drive (the one with Win 10 on it) back into the computer and try to boot from it, I get that grub screen.

I have tried all sorts of things in the bios menu and in the boot order, but none of them have worked.

I saw some complicated answers on rebuilding the UEFI online as well.

But should I just try running the "Run UEFI Application..." on the drive first??? Is that what it is designed to fix? Or does it do something else?

There doesn't seem to be a lot of information on what this does or how to use it 😞

[mdklassen · Accepted solution]

With the disk-drive containing Linux not attached, have you tried booting from a Windows DVD, and choosing "Repair" ?

Maybe, it can fix the "startup" ???

[dc7800]

Thanks for the reply.

What you said is "more or less" correct.

Basically, I used the windows install disk, and instead of re-installing (which obviously would have wiped the disk) I used the repair option.

It turns out that in the repair options on the windows 10 disk there is a UEFI utility. It doesn't really explain anything, but I just used it (basically one click) and it worked.

It does something, then reboots the computer. I was then presented with a blue menu list (similar to when you press the esc key during boot up) and at the top the choice was continue. So I pressed continue and it booted into windows fine.