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Computer doesnt turn on after power outage

Discussion in 'Hardware' started by dotblack, Aug 19, 2009.

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  1. dotblack

    dotblack Thread Starter

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    After my power went out for a second my computer didnt turn on anymore. Every time I press the power button the case fans and cpu fans turn on for a sec then turn off. The ethernet slot light turns on if that matters. Also I tried turning it on without the graphics card and ram connected and still the same results. Whats wrong with my computer??
     
  2. Tanis

    Tanis

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    Hi, my initial thoughts would be that the power outage may have fried your PSU (Power Supply). It is possible to that that the CPU and/or motherboard (or other components) may also have been damaged.

    If you can get hold of a known good PSU it may be worth putting that in to check first of all.
     
  3. CTPhil

    CTPhil

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    What brand of computer? Some pre-builts have diagnostic lights on the motherboard which can be useful in identifying a problem.
     
  4. dotblack

    dotblack Thread Starter

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    my mobo is asrock if thats what you mean?
     
  5. frankjohn

    frankjohn

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    The only way to check would be to replace the power supply with the same wattage or larger wattage.Like stated in other post power supply >mother board or both could have been taken out
     
  6. Rich-M

    Rich-M

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    Flip the switch on the psu off. Then pull the power cord out and press the start button for 5 seconds or so. Leave it sit for about 1/2 hour and put power cord back, swich power on and try again. You should be able to boot this way but it tells you the psu is the problem and it won't stay on,oong anyway.
     
  7. dotblack

    dotblack Thread Starter

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    i tried a different psu but with the same results. All the fans turn on ; cpu fan and case fans and the graphics card light for one second then it turns of. I tried my psu on another computer also and it works perfectly.
     
  8. Rich-M

    Rich-M

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    What type of video card does this unit have as that would be the next thing to try a replacement for.
     
  9. dotblack

    dotblack Thread Starter

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    i have an xfx ati hd 4890 but i tried turning it on without it connected and also disconnected w the hdd and disk drive with the same results. Do you think perhaps it is my mobo? Ive heard the cmos battery causes problems like this. Is there a chance that that might be the case because it would be much cheaper and easier than buying a new mobo.
     
  10. Rich-M

    Rich-M

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    It would never start with the video card out, that is a waste of time. Does this have onboard video by any chance you could try?
     
  11. dotblack

    dotblack Thread Starter

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    i dont think so. My mobo is an asrock g31m-s.
     
  12. Rich-M

    Rich-M

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    You have onboard video. Take the card out and hook to the onboard video card and see if it starts up.
     
  13. dotblack

    dotblack Thread Starter

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    How do i turn on the onboard video? Also wouldn't it not matter since without any of the other things connected except the cpu the cpu fan would turn on for a second then turn off?
     
  14. frankjohn

    frankjohn

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    Power supply
     
  15. crjdriver

    crjdriver Moderator

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    I agree it sounds like at the very least you fried the pw supply. In post #7 you stated that you tried another psu. Was this a known good unit?

    Next here is what I would try next;
    1 Open the case and pull the pw connectors from ALL drives; both hd and optical
    2 Pull out any add-in cards; ie sound, nic, raid, etc. Since it has onboard intel video, pull out your video card as well. Connect the monitor to the onboard video.
    3 Clear cmos with the clear jumper for a min of 20sec. Replace jumper to keep position.
    4 Connect a known good pw supply to the system.
    5 Pw ON and see if you get a post display. If you do, shutdown and start connecting devices one at a time until you find the problem. If you do not get a post display, then you need to swap the remaining parts with known good units; ie mb, cpu, ram.
     
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