1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

My PC starts up for 3 seconds, then shuts down.

Discussion in 'Off Topic' started by Vincent, Jan 15, 2013.

  1. Vincent

    Vincent Well-Known Member


    I have placed an extra HDD in my computer because I had received Windows 8 from my dad.

    I had connected all the cables, but when I wanted to power on my computer my PC acted normal for 3 seconds but then it shut down.

    I have recently placed a new Graphics Card: VGA Sapphire Radeon HD7870 OC 2GB, this is a pretty good card so I was worried that it was broken.

    This doesn’t seem to be the case, because I removed the graphics card and the problem still occurs.
    I removed my original + new hard disk + dvd writer + all the ram and the problem persists.

    My question is: Is the power supply or the motherboard broken?
    The most logic explanation for me is that the power supply is broken. The Graphics Card uses a lot of energy already and the new hard disk probably overloaded the power supply.

    What is your opinion? What should I replace first?

    I hope you can give me some advice, as I use the PC very often.
    - Vincent
  2. James

    James Well-Known Member

    Does it get to a boot screen at all?

    Seeing as it's Windows, can you boot into safe mode or the BIOS settings?

    If you can't get to any of the above, it would seem the problem occurs before the OS is loaded and is likely a hardware issue. It narrows it down a little.
  3. Vincent

    Vincent Well-Known Member

    I'm pretty sure it's a hardware problem. Also, it's really in the first few seconds of the boot that it shuts down, so that must be hardware.
    It narrows it down, but it's expensive :p

    I am really thinking that it's the power supply :(
  4. ijeffers

    ijeffers Active Member

    Not overheating is it - check all fans working?
  5. Vincent

    Vincent Well-Known Member

    The Processor's fan is working, the back fan is working and the fan of the PS is working.
    I really have no idea what's wrong.. The power supply gives power, but it looks like it loses the power after a few seconds.
  6. Luke F

    Luke F Well-Known Member

    What is the make, model and wattage of your power supply?
    0xym0r0n likes this.
  7. ManagerJosh

    ManagerJosh Well-Known Member

    How powerful is your power supply? it sounds like it doesn't have enough power to power the unit.
  8. Vincent

    Vincent Well-Known Member

  9. Vincent

    Vincent Well-Known Member

    By the way, I disconnected everything from the PS. It's only connected to the motherboard atm.
  10. Ditto

    Ditto Member

    If working OK before you installed the extra HD, sounds to me like you have too much drawing power now from the PSU going over voltage, why it's going into auto shut down. Try unplugging the extra HD and see if all is OK again, if yes I'd suspect you need a bigger PSU to handle things.

    Some cheaper PSU for their wattage 700W, don't cope as well as better quality more expensive PSU's of same power rating.
  11. ManagerJosh

    ManagerJosh Well-Known Member

  12. Vincent

    Vincent Well-Known Member

    I have disconnected everything and it still has the problem..

    I had 8 GB of RAM (now removed), I have an Intel Quad-Code CPU (I don't know the model number..) and 2 hard drives since today. One graphics card (you can see the model number at the OP) and a dvd writer.
  13. Luke F

    Luke F Well-Known Member

    It doesn't look like a very good power supply - 4 rails isn't a good design and I've never heard of the brand before.

    If you are getting a new one, get something OEM'd by Seasonic such as XFX etc.

    Try the paperclip trick on the PSU, because I've got a sneaking suspicion you have shorted out your motherboard (dropped a screw on it? no standoffs? static damage?) and there's really nothing wrong with the PSU.
  14. Ditto

    Ditto Member

    There is a chance then the PSU could either be on it's way out. Could also be full of dust and needs a really good cleaning out, it's overheating too fast (not after 3 seconds though). But shutting down like that makes me think it's linked to a PSU problem. Does the PSU have a fan? If yes, is it still spinning to extract heat, check that's not stopped working if it has one.
  15. Ditto

    Ditto Member

    If you're not even getting the windows boot screen at all, could be a motherboard problem as well, but would have thought it wouldn't auto power down unless PSU problem. Worth checking that the RAM is seated firmly in the slots proper as well. Hate to complicate things, but it could also be a blown CPU, had it happen to me and computer started then shut down seconds after. Turned out CPU was blown, when I thought it was PSU at fault.

    In fact, it may be the CPU. I would press start power button, hear fans starts and then would just shut down. CPU was the problem and worked fine when replacing it.
  16. Luke F

    Luke F Well-Known Member

    Auto power down during the first couple of seconds usually happens when the motherboard is shorted out by something.

    If the PSU were at fault, usually it will be either totally dead or only cut out during high load.
  17. Ditto

    Ditto Member

    Yeah, thinking more about it now. 3 seconds is too fast. tend to think either motherboard is broke or CPU is blown.
  18. Luke F

    Luke F Well-Known Member

    What model is the motherboard?
  19. Slavik

    Slavik XenForo Moderator Staff Member

    And people looked at me crazy when I dropped nearly £200 for my seasonic PSU :D
  20. Brandon Sheley

    Brandon Sheley Well-Known Member

    Power supply sounds like the problem to me. ;)

    I'd replace it, they're fairly cheep.

Share This Page