Quote Originally Posted by YesWeCan View Post
Hopefully some of the earlier posters who have similar symptoms will try out these solutions and report in.
Solve for Squeeze/Debian with RAID 1.

It's a bug in "graphical terminal" !

In file "/etc/default/grub", just uncomment the line:
GRUB_TERMINAL=console

Do:
update-grub

Reboot.
Disconnect (or disable) /dev/sda.
Boot on the second disk (become /dev/sdb)

The Grub menu appear and you can, now, boot on the second disk: Amazing isn't it ?