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Thread: Boot failure, suspect harddisk problem, no KB or mouse

  1. #1
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    Boot failure, suspect harddisk problem, no KB or mouse

    Ubuntu LTS

    It all started on today's boot which stopped with "SGX disabled by BIOS" and dead KB and mouse

    I have seen SGX disabled messages on forums and it seems this may mean a harddisk problem.

    Boot attempt 1: looks normal, keyboard flashes and is working, GRUB pops up, all good, then "SGX disabled by BIOS". Now the KB and the mouse are dead.

    Boot attempt 2: looks normal, keyboard flashes and is working, GRUB pops up, I navigate with the KB to any other entry, e.g. memory check, then PC dead. Now the KB and the mouse are dead too.

    Boot attempt 3: looks normal, keyboard flashes and is working, switch into BIOS (yes I know its not BIOS anymore). Up pops the usual BIOS screen. Now the KB and the mouse are dead so I cannot do anything.

    I also tried to boot from a Rufus USB, but the boot sequence never gets to the USB boot.

    What can I try?

    Help !

  2. #2
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    KB and mouse dead in BIOS tells me that it is not a HDD issue. You should be able to do anything you want in the BIOS without even having an HDD in the machine. My first thought is a power supply issue. When the mouse goes dead, flip it over and see if the laser light is still on. If not, then we have a power supply issue. Next step would be to disconnect EVERYTHING from the PC except for the mouse. Turn the machine on and just watch. Does the mouse's light die? If not, connect KB (with machine still turned on) and just watch and see what happens. You don't want to do anything but watch.

    Report back.

  3. #3
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    SGX stands for "intel Software Guard eXtensions and is "a hardware-based isolation and memory encryption mechanism provided by modern Intel® CPUs".
    You may get lucky enough by adding this to Grub "nosgx"
    Code:
    sudoedit /etc/default/grub
    Add to this line:
    Code:
    GRUB_CMDLINE_LINUX="nosgx"
    And yes update-grub after saving the file change.
    Code:
    sudo update-grub
    Reboot.
    With realization of one's own potential and self-confidence in one's ability, one can build a better world.
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  4. #4
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    Good thinking !
    "When the mouse goes dead, flip it over and see if the laser light is still on. " - Yes it is still on.
    The KB Num lock light is still on too. But I cannot do anything to change the KB lights.
    "disconnect EVERYTHING " - that is quite a lot. I'll experiment.

  5. #5
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    Did you update UEFI firmware, which would reset many settings to defaults?
    Many motherboards have settings for "full USB" support or enable USB keyboard & mouse. Check manual as often UEFI descriptions are very brief.
    Grub normally requires UEFI for initial use of keyboard & mouse as it does not have its own drivers. Once booted Ubuntu's drivers are used for Ubuntu.
    UEFI boot install & repair info - Regularly Updated :
    https://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  6. #6
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    No disconnects - mouse lights work as before, even if PC frozen.

    I disconnected the LAN and the mouse. In the BIOS the KB worked for a few seconds (arrow keys) then everything stopped. e.g. Num lock stays on even if switched off. Caps lock will not switch on.
    I disconnected the loud speaker. In the BIOS the KB worked for a more few seconds then everything stopped.

    Any more tests I can do?

  7. #7
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    Hi OldFred - good to see you.

    To my knowledge there were no UEFI changes. Indeed no changes at all in the last days.

    Any ideas?

  8. #8
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    Thanks for the suggestion.

    Following the earlier suggestions it s starting to looks like the power supply.

    e.g. even the BIOS (UEFI) is not working.

  9. #9
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    Apologies to all : I should be using 'Reply with quote'


  10. #10
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    Re: Boot failure, suspect harddisk problem, no KB or mouse

    Latest status report

    This is clearly a power supply problem but probably not with the PSU.

    I opened the case and played around with the power contacts and briefly got the PC to boot.

    But now it has failed again.

    The situation now:
    - power on, KB and mouse good.
    - switch to UEFI (BIOS)
    - the UEFI is active, I can see the voltages and they are all correct.
    - KB and mouse work for about 4-5 secs, then nothing can be done
    - the fans keeps working

    Does the UEFI start trying to power up the disks? Or does that happen only after you exit from the UEFI?

    I imagine that the problem must be with the contacts? Could it be something else?

    Any ideas on how to proceed?

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