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My PC Shuts down after 5 seconds

Discussion in 'Windows Vista Help' started by HAMMER0402, Dec 27, 2009.

  1. HAMMER0402

    HAMMER0402 Techie7 New Member

    Im having an annoying problem with my PC:wacko: I turn on the power, the light comes on and after no beeps or anything (roughly 5 sec.) it just shuts down. Should I try the battery on the mboard? Change the power supply? Any help would be greatly appreciated.:confused:
     
  2. Digerati

    Digerati Super Moderator Techie7 Moderator

    Did it ever work?

    The battery on the motherboard would not cause it to shut down.

    Sadly, this type problem could be caused by many things, which makes it very hard to troubleshoot. It could a bad CPU, bad RAM, bad graphics card, or a bad motherboard. It could also be a bad PSU and since that's where life in the computer starts, that is where I would start - assuming this is not a new or just upgraded computer, and it was working fine before this problem started.
     
  3. HAMMER0402

    HAMMER0402 Techie7 New Member

    Thanks for your quick response. The PC is only 2 years old, it always worked fine and never did this before. Is it possible a faulty power supply might cause this?
     
  4. Digerati

    Digerati Super Moderator Techie7 Moderator

    As I said above, that is where I would look first. Here's my canned text on testing supplies:

    To properly and conclusively test a power supply unit (PSU), it must be tested under various realistic "loads" then analyzed for excessive ripple and other anomalies. This is done by a qualified technician using an oscilloscope or power analyzer - sophisticated (and expensive) electronic test equipment requiring special training to operate, and a basic knowledge of electronics theory to understand the results. Therefore, conclusively testing a power supply is done in properly equipped electronic repair facilities.

    Fortunately, there are other options that are almost as good. I keep a FrozenCPU Ultimate PSU Tester in my tool bag when I am "in the field" and don't have a good spare power supply to swap in. While not a certain test, they are better than nothing. The advantage of this model is that it has an LCD readout of the voltage. With an actual voltage readout, you have a better chance of detecting a "failing" PSU, or one barely within specified ATX Form Factor Standard tolerances. Lesser models use LEDs to indicate the voltage is just within some "range". These are less informative, considerably cheaper, but still useful for detecting PSUs that have already "failed". Newegg has several testers to choose from. All these testers contain a "dummy load" to fool the PSU into thinking it is connected to a motherboard, and therefore allows the PSU to power on, if able, without being attached to a motherboard - great for testing fans, but again, it is not a true load or suitable for conclusive testing.

    As mentioned, swapping in a known good supply is a tried and trued method of troubleshooting used for years, even by pros. Remove the "suspect" part and replace with a "known good" part and see if the problem goes away.

    I do not recommend using a multimeter to test power supplies. To do it properly, that is, under a realistic load, the voltages on all the pins must be measured while the PSU is attached to the motherboard and the computer powered on. This requires poking (with some considerable force) two hard and sharp, highly conductive meter probes into the main power connector, deep in the heart of the computer. One tiny slip can destroy the motherboard, and everything plugged into it. It is not worth the risk considering most multimeters, like plug-in testers, do not measure, or reveal any unwanted and potentially disruptive AC components to the DC voltages.
     
  5. jephree

    jephree ¨*·.¸ «.·°·..·°·.» ¸.·*¨

    Just to add:

    The 5 second (or perhaps 3 second) issue often points to a faulty power switch.

    By default if you hold that switch for 3 seconds it will sut down the computer.

    Your issue could perhaps just be a faulty switch.
     
  6. artmy

    artmy Guest

    Hello Frineds,
    Computer Shuts down after 5 seconds. This issue could be caused by any of the below possibilities.
    • Heat related issue.
    • Hardware issue or error.
    • Computer virus.
    • Issue with operating system.
    • Other failing hardware

    Thanks,
    James