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I run GRUB Boot-loader with open SUSE 13.2.

I set timeout=0 at Boot-loader Options tab and Default Boot Section='Windows 7***'.

From then on, I couldn't see the GRUB menu to select which OS I want to boot

How do I get the boot menu back?

2
  • Have you tried pressing ESC key before windows starts to boot? Just after POST.
    – YoMismo
    Jul 29, 2015 at 14:37
  • 1
    Please accept the answer if it has solved your query. It'll be helpful for other with similar issues
    – neuron
    Aug 5, 2015 at 3:02

3 Answers 3

4

Try holding down the Shift key just after POST

1

If the above fails, it's quite easy (usually) to boot from any Linux live image (e.g., from a USB thumb drive), mount the /boot filesystem, and edit grub2/grub2.cfg on that to undo your change. For that you add

set timeout=10

to the very end of the file.

Do heed the warning at the beginning of the file, though — that file will get automatically overwritten, you will also have to change /etc/default/grub to undo the changes that led to timeout being 0. (But you can do that once you've normally booted your system).

0

I got it working with these:

  1. In etc/default/grub, set GRUB_TIMEOUT=0
  2. In the same file, set GRUB_TIMEOUT_STYLE to hidden or countdown. Don't set it to menu as it uses a different loop that is not interruptible.
  3. In theory,pressing SHIFT before booting the system should interrupt the boot process and show the GRUB menu. In practice, on some EFI systems the SHIFT keypress is not relayed to GRUB due to how the underlying firmware works. In those cases, press SHIFT+non-ASCII character (e.g. SHIFT+F1) before the boot process to get to the GRUB menu.

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