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Pc restarts or shuts down by itself

Discussion in 'BlackHat Lounge' started by darkman, Feb 18, 2011.

  1. darkman

    darkman Regular Member

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    Anyone have any ideas why this happens?

    Viruses or the power supply unit got problems?
     
  2. MoneyMafia

    MoneyMafia Regular Member

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    same thing happens to me. I think there is a lot of dust in power supply or ventilation area as is shuts down only when I use a lot of CPU power otherwise..never happens
     
  3. gtara4

    gtara4 Registered Member

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    from my experience it could be trojan
     
  4. Freestar100

    Freestar100 Registered Member

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    Once I downloaded a software called Snafu supposedly to fastrack my FTP upload but lo and behold when I run the application my PC just reboot on its own...I was forced to reformat...

    I hate that Snafu and it is still distributed everywhere as a freeware.
     
  5. JesusBack

    JesusBack Executive VIP Premium Member

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    o that's your computer? okay I'll stop ;)
     
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    Last edited: Feb 18, 2011
  6. hpv222

    hpv222 Power Member

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    90% of the cases - CPU overheating, so check your fan and clean the dust

    run a full virus/malware scan as well just to be sure

    power supply - never seen doing anything like this, when they go, they go in stle - your computer doesn't power up at all ;)

    if none of the above helps, power off, then reset everything - memory sticks, graphic cards, etc. make sure that they are set firmly in place
     
  7. zacatictac

    zacatictac Power Member

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    Could be overheating. Good be someone infected you with a RAT.
     
  8. MikeLac

    MikeLac Regular Member

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    Same thing happened to me a couple of Months ago.

    Computer would randomly power down. Thought it was a power supply problem. Opened up the case to investigate and quickly discovered what I figured was the true source of the problem.

    The replies above are correct. Dust. The heat sink was clogged. A can of air duster quickly took care of that problem.

    Strange thing was, when I'd come home from work the computer would be off because it shut itself down. I'd power it on and it would shut itself off before it even fully booted up. The CPU never even had a chance to overheat in that amount of time. I'm assuming that the lack of airflow to the CPU triggered the shut down.

    It has been running for 2 Months straight and only been rebooted 2 or 3 times by me because of Software installation/removal.
     
    Last edited: Feb 18, 2011
  9. NoirHat

    NoirHat Regular Member

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    overheating
    driver issue
    mem stick flakey
    virus
    hard drive disc failing
    power supply flakey

    that about covers it
     
  10. unknownassailant

    unknownassailant Newbie

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    Old Compaqs were famous for that. Try a beefier power supply.
     
  11. dgfalk

    dgfalk Power Member

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    I agree that its probably a overheating problem as well. Open the case and make sure the cpu fan is running and these no dust clogged up in the cpu heat sink.

    I disagree about the power supply "when they go, they go in style" Ive seen tons of power supplies that will shut off once they get hot, let them sit for awhile and thery will fire right back up again once they cool down. And 99% of the time that happens, the fan inside the power supply took a shit, not the power supply itself.
     
  12. F0l2saken

    F0l2saken BANNED BANNED

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    Random reboots are randomly caused by overheating, overheating will cause it but that's seldom the case. And I disagree with your diagnosis of power supplies, there might be a few that do what you say, but most of the time a power supply goes it goes, it doesn't half work and half not.

    If you clean your fans and the problem still persists, which i'm betting it will you need to look other places. Check for viruses, though most of the times cleaning a virus out of a computer will not undo the damage it does and an OS reinstall might be necessary. Download and run spybot search and destroy, avg free, and malware bytes. If all 3 of them do not find anything and your random reboot still continues then it can be usually 1 of two things.

    Something is F'd with the operating system, backup your data, try to reinstall. If the problem still persists i'd look to hardware, recently I knew a computer to blue screen and randomly reboot and it was due to the memory, although none of the memory tests would diagnose the memory as bad. If you have ddr2 or ddr3 than more than likely you have 2 sticks and are dual channeled, try each stick separately in slot #1 to see if that makes the computer run any better.

    If it's a windows operating system you'll spend a lot more time trying to figure out WHY than you will by simply backing up the data, making sure you have all the programs to reinstall, and just reinstalling windows.

    I fix several computers a day (that's my job) so it's safe to say I work on thousands in a year, and 90% of the time the best t hing for a windows OS when it's hosed is reloading it.
     
  13. F0l2saken

    F0l2saken BANNED BANNED

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    A majority of the time a failing hard disc does not reboot an operating system, it locks it up when it can't read from it, and it'd be pretty obvious, most operating systems/bios/hard drives use smart drive, it'll tell you when you turn your computer on if the hard drive has issues
     
  14. ronegraT

    ronegraT Power Member

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    Search your computer for viruses, dust of the fans try to remeber if you are doing the same thing every time it chrashes?

    You could also try the program Whocrashed, it analyses dumpfiles on your computer

    Code:
    http://www.resplendence.com/whocrashed
    
     
  15. minxx

    minxx Newbie

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    cpu shutting down usually caused from hardware malfunction..i have experienced in repairing people's laptop and pc.what you can do is use a fan to cool down your pc..
     
  16. darkman

    darkman Regular Member

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    Thanks for all the suggestions guys.
    I'll try to look into the dust part.

    I already repair my operating system and run a scan using advancedsystemcare and iobit360,Found a few viruses and trojans.

    No wonder when the pc reboot once , smiley face came out on the screen.

    Thanks again.
     
  17. halifax123

    halifax123 Power Member

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    for me it was a trojan

    mimicked the same behavior

    In my case I had what we'll call "warning" In my case a pop suddenly came from my "task bar" !!! if it was a pop up in a windows session that's one thing, but this one came from with a dialog balloon popping up from my task bar and asking me to consider purchasing a particular product because my pc might be infected! I knew I was toast!!

    BUT I knew I had time before I shut down that eve...

    So I loaded up my anti virus....it found multiple trojans!!
    went and looked them up since I could still get online...
    I read about em...knew I was TOAST...I then had my anti-virus
    "PULL THEM" I knew that would make my system stopped working!!!

    Sure enough the next morning when I tried to start, it would do just as yours did

    BUT these days they want to make a buck, rather than just "screw you"
    SO if you didn't get any strange behavior, or "something" didn't ask you
    to suddenly "buy something" and appeared to come from your own desktop as a request for purchase

    maybe it is then another matter as the above posts say

    Hali~!:)
     
  18. Curt7

    Curt7 Junior Member

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    Some great answers here. I appreciate them and have copied for times when this happens to me. I seem to have to reinstall Windows every couple of years because of the crap that gets into it.
     
  19. kirkonpolttaja

    kirkonpolttaja Senior Member

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    Clean your pc, i have always huge pile of dust on my fans.