power failure - no keyboard in grub menu

[Amichai Rotman]

Another trick:


   1. Turn off the computer.
   2. Disconnect the power cable.
   3. Press the power button a few times to discharge any built up
   electricity.
   4. Disconnect the keyboard.
   5. Connect the power cable.
   6. Turn on the PC and wait until it passes the BIOS screens and into
   GRUB.
   7. Hold the power button until the computer shuts down (only if it's
   stuck!)
   8. Reconnect the keyboard and try to boot normally.

All this assuming you have a PS/2 keyboard. If it's a USB keyboard, make
sure the BIOS is set to allow USB keyboards.

Amichai.


On Wed, Apr 24, 2013 at 10:13 AM, shimi <linux-il at shimi.net> wrote:

> On Wed, Apr 24, 2013 at 10:03 AM, Gabor Szabo <szabgab at gmail.com> wrote:
>
>> 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?
>>
>>
>>
> Check your BIOS for an option that blocks keyboard "until the OS is up".
> This bit may have been flagged in the BIOS memory by the power glitch. If
> you can't find it, you can simply try to restore your BIOS to
> factory/fail-safe conditions, or disconnect it from mains, pull out the
> CMOS battery for a minute or so, and then return it..
>
> HTH,
>
> -- Shimi
>
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