cannot get to grub (SOLVED)

[Prsman]

I just installed mint 20.3 cinnamon on my gaming desktop with a Nvidia card. I need to get to the grub menu but cannot, The shift key does not work, esc key gets me the boot menu. Select the installed drive, enter and I get a corrupt screen. Holding down the shift key while pressing enter gets me the same garbled screen, as well when holding the esc key. I need to get to grub to use the nomodeset to get to the desktop. Can I boot the install usb, modify the grub on the harddrive?
Desktop is an Asus ROG with Nvidia GTX1660 video card. What to do? Thamks

[ajgreeny]

I always like to see the grub menu for just 2 seconds in all my systems as it is so much easier that way than trying to hit Esc at the correct moment to get it to show on a UEFI machine.

The easiest way to get that is to edit the /etc/default/grub file so the config lines look like this.

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GRUB_DEFAULT=0
#Next line will make the countdown time show the menu
GRUB_TIMEOUT_STYLE=menu
#Next line changed from 0 to 2 for 2 second delay
GRUB_TIMEOUT=2
#Next line changed from true to false to allow delay countdown to show
GRUB_HIDDEN_TIMEOUT_QUIET=false
#Next line changed to show the real distro name as I want it
GRUB_DISTRIBUTOR="Mint Xfce 20.3"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
#Next line needed on new versions to allow dual boot machines to detect other OS
GRUB_DISABLE_OS_PROBER=false

All lines starting with # are simply my explanation lines and some of those config lines, eg, just for clarity are my own choice.
You must run

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sudo update-grub

after editing that file to get the new config to work.

[Prsman]

Thanks for the reply. I found the magic key combo to get into grub. Once I'm up and running I will look into your grub file. Thanks

[JerryF]

Thanks for the reply. I found the magic key combo to get into grub. Once I'm up and running I will look into your grub file. Thanks

Which were the magic keys? It might help others.

[Prsman]

Ok here are the magic keys to get to grub on this CPU.
At boot press the ESC key which gets the boot menu up. Select the drive you want. Press the ESC key once, then press enter. Grub on display.

Computer is a Asus ROC gaming desktop.

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Machine:
  Type: Desktop Mobo: ASUSTeK model: GL10CS v: 1.0 serial: <filter> 
  UEFI: American Megatrends v: GL10CS.309 date: 11/27/2019