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Just enter the command 'exit' (without the quotes of course). It should take you to another menu that makes you select the Windows bootloader.

Worked on Lenovo Y50

To boot to Windows, if Windows is installed on first drive/partition, enter in grub command line:

insmod chain

insmod ntfs

set root=(hd0,1)

chainloader +1

see https://www.gnu.org/software/grub/manual/html_node/Chain_002dloading.html#Chain_002dloading for more details.

The following worked for me with a GPT partitioned disk.

insmod part_gpt

insmod chain

set root=(hd0,gpt1)

chainloader /EFI/Microsoft/Boot/bootmgfw.efi

boot

Note that you can enter a command line from the grub boot menu and just type commands as above to test out different combinations.

You need to enter the id of the EFI boot partition (not the windows partition) for the set root= command.

In the command line grub mode ls will list the hard drive partitions, help lists available commands.

Once you have set the root correctly you can ls / to view files and directories to find the correct path to the windows boot manager if it is not in the default location.

Guesing you have an UEFI device, the windows bootloader is still installed. You can select it back in UEFI setup menu under boot, where you will prbably have two options (GRUB and the old default as the second), delete the first one or switch the order.

Boot from DVD win 10

Open command line and type:

diskpart



select disk 0





list volume

check bootsect.exe

For example E is the DVD

E:

cd boot

dir

if bootsect.exe exist type the following command :

bootsect /nt60 SYS /mbr

or bootsect /nt60 your-drive-letter: /mbr

example bootsect /nt60 C: /mbr

Reboot

I recently bumped into the same problem. (i.e. originally have a a separate partition with Ubuntu installed, dual bootable from a grub menu. I then deleted that Ubuntu partition from Windows disk management, and when I rebooted, just the grub command menu).

What I did to get back to my Windows 10:

1. Do a Ctrl + Alt + Delete to reboot. While rebooting, hold down the shift button.


2. My PC then give me to option to press F12 for boot option. I clicked F12, and it gives me back a menu with Windows boot manager on it.


3. I selected the Windows boot manager and click enter. I'm now back to Windows 10.

This worked for me, now I have to find a way to permanently fix the mbr.

I recently bumped into the same problem. (i.e. originally have a a separate partition with Ubuntu installed, dual bootable from a grub menu. I then deleted that Ubuntu partition from Windows disk management, and when I rebooted, just the grub command menu).

What I did to get back to my Windows 10:

Do a Ctrl+Alt+Delete to reboot. While rebooting, hold down the shift button.
My PC then give me to option to press F12 for boot option. I clicked F12, and it gives me back a menu with Windows boot manager on it.
I selected the Windows boot manager and click enter. I'm now back to Windows 10.

This answer is for those with UEFI who have deleted the Ubuntu partitions before removing grub

You will be doing this from Windows 10. No bootable media required.

Where bootrec /fixmbr, bootsect /nt60 and the Ubuntu live with the boot-repair suggestions have failed, this has worked for me:

(This answer borrowed verbatim from here)

1. Run a cmd.exe process with administrator privileges


2. Run diskpart
   


3. Type: list disk then sel disk X where X is the drive your boot files reside on


4. Type list vol to see all partitions (volumes) on the disk


5. Select the EFI volume by typing: sel vol Y where Y is the SYSTEM volume (this is almost always the EFI partition)


6. For convenience, assign a drive letter by typing: assign letter=Z: where Z is a free (unused) drive letter


7. Type exit to leave disk part


8. While still in the cmd prompt, type: Z: and hit enter, where Z was the drive letter you just created.


9. Type dir to list directories on this mounted EFI partition


10. If you are in the right place, you should see a directory called EFI
    


11. Type cd EFI and then dir to list the child directories inside EFI
    


12. Type rmdir /S ubuntu to delete the ubuntu boot directory

Assuming you only ever had two operating systems (Win 10 & Ubuntu) you should now be able to boot directly to Windows without hitting the black grub screen.

Copied from https://askubuntu.com/questions/429610/uninstall-grub-and-use-windows-bootloader

Just exit the grub by typing exit and go to bios setup and restore to default settings and restart the computer.

Try this:

rootnoverify (hd0,0)

chainloader +1

makeactive

boot