power failure - no keyboard in grub menu

[Gabor Szabo]

hi

after a power failure when I try to boot my Ubuntu 12.04 machine it
displays the Grub menu but it
does not react to any keyboard combination I tried.


If I press Del earlier, it does get in the BIOS and there I can use
the keyboard, so it does not seem to be a hardware issue, but in the
GRUB menu no reaction.
So this things seems to be stuck.

Any idea what could I do?

regards
   Gabor