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Thread: I can't use the keyboard or mouse at the log in screen or boot loader

  1. #1
    Join Date
    Mar 2008
    Beans
    156

    I can't use the keyboard or mouse at the log in screen or boot loader

    Hi,

    I'm looking at my Dad's computer that has apparently been continually re-booting every few minutes once it gets to the log in screen for about a week or so (perhaps longer). I've now seen the same thing happen. It gets to a normal log in screen but it's not possible to input anything via the USB keyboard or USB mouse. I've plugged both into my laptop and they are working fine.

    I can get to the GRUB boot loader and can use the keyboard here. If I choose recovery mode, I then don't have access to the keyboard any more and can't choose recovery mode.

    I can get to GRUB in command line mode, but then I get stuck as I don't know what to do to boot into safe mode or anything else. I've had a look and found a list of commands, but didn't understand what would be useful to use.

    Would it be best to use a liveCD to try to reinstall Ubuntu, or is there something better I should try first?

    Thanks!

  2. #2
    Join Date
    Sep 2009
    Location
    Pennsylvania
    Beans
    2,819
    Distro
    Xubuntu

    Re: I can't use the keyboard or mouse at the log in screen or boot loader

    Can you give us some specs on the machine please?

    Could be either hardware or software issue. My first thought would be a power supply issue or memory issue. Could be a myriad of other HW issues, too. How many USB things are connected? If more than keyboard and mouse, just try disconnecting all of them and see if it will boot. If it does, then either too many are connected, one or more are drawing too much power, or the power supply is weak / failing.

  3. #3
    Join Date
    Dec 2017
    Location
    RockyMts
    Beans
    1,143

    Re: I can't use the keyboard or mouse at the log in screen or boot loader

    At the grub screen press

    Ctrl + Alt + F1

    That will take you to console, keyboard should work there.

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