At what point does it ask for a password?
At the grub2 menu (when you select a OS) or is it later in the boot process?
If it is at the grub2 menu, then you have specified it someplace to require a password.
If it is later in the boot process, then you probably checked the box on install to encrypt the filesystem.
From what you stated above, it appears you have specified a grub2 password. Look in your /boot/grub2/grub.cfg file for a few things...
Do you have any line like these?
Code:
set superusers="root"
password_pbkdf2 root grub.pbkdf2.sha512.10000.biglongstring
password user1 insecure
And do any of your menuentry have a parameter on them like these?
Code:
menuentry "May be run by any user" --unrestricted {
menuentry "Superusers only" --users "" {
menuentry "May be run by user1 or a superuser" --users user1 {
If you see any of those, then you password protected grub2.
You can remove the items from your /boot/grub2/grub.cfg file (or just specify the --unrestricted parameter on all the menuentry lines for your OS's) and allow it to boot without requiring a password.