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Thread: Can cutting power damage PC

  1. #1
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    Can cutting power damage PC

    Hi, I wanted to save some electric energi, and turned off the power to my Ubuntu PC, ( after shutting it down in normal way). Now I can not start it again, it seems to be confused about some mounting points. I run memory check - turned that off after 3 hours, it was still checking memory.
    Any suggestions anyone. Must point out that Ubuntu worked just fine until this.
    Regards janerik

  2. #2
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    Re: Can cutting power damage PC

    Now I can not start it again, it seems to be confused about some mounting points
    there are different ways it can get confused over mount points. specifically what is it telling you?

    If you simply shut it down and didn't make any drastic changes (like a dist-upgrade) and memory checked out then I'd immediately start suspecting the hard drive (and preying it isn't the motherboard)

    the actual output may give us a better idea, though.
    Last edited by decoherence; June 11th, 2008 at 04:08 PM. Reason: typo

  3. #3
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    Re: Can cutting power damage PC

    So let me get this straight you turn off the computer by clicking on turn off, it then did so, and then you turned off the power from the power supply/outlet?

    The only thing this would effect is the CMOS battery, which powers the Memory that hold the BIOS information like boot order and motherboard settings. If that battery cannot hold a charge or dies, it can mess up a computer that boot more than one hard drive and may give them a new order, which could mess up your mount points.

    Now if you just pulled the plug or did a hard shutdown (holding the power button until it turns off), then it is a possiblity that the hard drive coiuld have been effected.
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    Re: Can cutting power damage PC

    Quote Originally Posted by janerik View Post
    Hi, I wanted to save some electric energi, and turned off the power to my Ubuntu PC, ( after shutting it down in normal way). Now I can not start it again, it seems to be confused about some mounting points. I run memory check - turned that off after 3 hours, it was still checking memory.
    Any suggestions anyone. Must point out that Ubuntu worked just fine until this.
    Regards janerik

    As ext3 is journaling system an abrupt shutdown of system through power button may lock the mounted partitions. Which means system still thinks these partitions are already mounted and therefore, it fails to mount next you boot your OS.

    Can you post the exact error you are getting?
    You came empty handed, that is how you shall leave. Whatever you claim as yours today, belonged to someone else yesterday, will be someone else's tomorrow.

  5. #5
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    Re: Can cutting power damage PC

    If you chose the "Shutdown" option, or hit the power button and saw the familiar progress bar going in reverse and the power went off, this is the normal way of turning the PC off.

    This should have absolutely no issue with starting the PC up again, the ONLY thing might be that depending on when the last time your partitions were checked, they might have to be checked. But apart from that this shouldn't cause any problems..
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    Re: Can cutting power damage PC

    I don't know of any system that if shutdown properly would result in damage to your system. If anything letting your computer rest when your not around will increase the longevity of your system.
    "Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live."
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  7. #7
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    Re: Can cutting power damage PC

    Another thing to check would be if you resized any partitions, the UUIDs in /etc/fstab would be invalid and need to be changed. The easy way to fix that problem is just to put path the /dev/ file for it in place of UUID=xxxxxxxxxxxxxxxxxxxxxxxxxx

    /dev/hda1 is usually the first partition on a non-SCSI HDD
    /dev/sda1 is usually the first partition on a SCSI HDD

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    Re: Can cutting power damage PC

    Quote Originally Posted by tbrminsanity View Post
    I don't know of any system that if shutdown properly would result in damage to your system. If anything letting your computer rest when your not around will increase the longevity of your system.
    But what about the thermal expansion/contraction?

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  9. #9
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    Re: Can cutting power damage PC

    Quote Originally Posted by decoherence View Post
    *prepares for religious war*
    "Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live."
    - Martin Golding

  10. #10
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    Re: Can cutting power damage PC

    I would be more worried about the hard drive spinning up and down if you are turning off an on all the time, I highly doubt expansion/contranction from heat will make a difference from what I have heard anyways. It's better to keep it on if you know your going to be using consistently, but you should turn it off if you are going to be away from it for a while.

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