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  1. #1
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    Default Custom PC will not Power On

    Hi all,

    First time poster.

    I went to turn on my custom PC the other day and found it would not power on. The fans would twitch, but it would not "crank" so to speak. I have reseated the RAM, as well as testing them individually in slot 1, the motherboard power indicator is lit up, the capacitors are good, and I have tested the voltage on my Power Supply.

    This says to me that power is reaching the motherboard, it reads the signal from the power button(its attempt to power up evidenced by the fans), and I am pretty sure my ram is fine.

    I am at a loss as to what is wrong here. Any suggestions?

    Here are the specs:

    Motherboard: MSI Z97- Gaming 7 LGA 1150 Intel Z97 HDMI Sata 6Gb/s USB 3.0 ATX Intel Motherboard
    Graphics Card: MSI GeForce GTX 980 Gaming 4g
    Processor: Inter Core i5-4690k Devil's Canyon Quad-Core 3.5GHz LGA 1150 88W Bx80646154690K Desktop Proceesor
    Ram: G.SKILL Ripjaws X Series 16 GB (2x8) 240-pin DDR3 SDRAM DDR3 2133 (PC3 17000)
    Power: Rosewill Hive Series 850W Modular Power Supply


    Thanks in advance!

  2. #2
    Senior Member pctek's Avatar
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    Default Re: Custom PC will not Power On

    Swap the PSu first. That's the easiest test.
    wipe your paws.

  3. #3
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    Default Re: Custom PC will not Power On

    Quote Originally Posted by helkresh View Post

    Power: Rosewill Hive Series 850W Modular Power Supply

    Thanks in advance!
    Look at all the failures in the customers reviews ....
    https://www.newegg.com/Product/Produ...82E16817182314

    As above. Most likely faulty power supply .
    You could try disconnecting everything except the motherboard & see if it powers on

  4. #4
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    Default Re: Custom PC will not Power On

    Wouldn't it be showing up as faulty on a volt tester though? I got a green signal when I checked it. Or am I misunderstand some aspect of power supplies which is very very likely.

  5. #5
    Computer Technician wainuitech's Avatar
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    Default Re: Custom PC will not Power On

    The fans would twitch, but it would not "crank" so to speak.
    Thats a sign of a power related problem, as others have advised.

    Theres power there but not enough to fire up the Computer.

    Its generally one of two things, either a faulty power Supply or Motherboard failure.

    The other thing that can cause it, is if something is causing a short Circuit.
    Last edited by wainuitech; 20-03-2017 at 10:06 AM.
    One thing positive about Windows 10 is that there is never a dull moment anymore on ye olde computer

  6. #6
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    Default Re: Custom PC will not Power On

    Can I definitively test these without a replacement?

  7. #7
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    Default Re: Custom PC will not Power On

    Quote Originally Posted by helkresh View Post
    Wouldn't it be showing up as faulty on a volt tester though? I got a green signal when I checked it. Or am I misunderstand some aspect of power supplies which is very very likely.
    what voltage rails is that thing actually testing. How accurate is it. At what level would it show the PSU as faulty ?
    Have you checked voltages with a multimeter. Are the voltages different under load .
    A cheap tester almost certainly wont show noise/spikes due to bad PSU's

    the 1st step is allways to try another PSU. Thats the easiest test ever .
    You need to do some part swapping to track down the cause.
    easier to swap PSU than motherboard

    I have seen faulty USB port causing similar faults, but thats not very common . Unplug front USB, check back USB port for damage.
    unplug all on/reset/led/sata/audio etc cables , start via shorting the on pins on the m/b itself

  8. #8
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    Default Re: Custom PC will not Power On

    Faulty caps , faulty mb can give the exact same fault .
    more likely to be PSU , but could be any of your parts

    2 choices
    send it out for repair, or start buying parts to swap out for testing.

  9. #9
    amateur expert dugimodo's Avatar
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    Default Re: Custom PC will not Power On

    Well a couple things you can try without parts to swap but it does seriously limit your options.

    1. A little risky so try at your own risk.
    If you get a piece of wire and insert it into the power connector between the green wire (pin 16) and one of the black ones it will force the PSU on. If it's just an issue with it starting up occasionally that will make things happen.
    I've only seen it actually work once though, on a faulty motherboard that wasn't sending the power on signal.

    Also note if you are voltage testing without a load it doesn't really mean much, many faults are not obvious until you try to draw some current.

    2. Disconnect absolutely everything not required to start up. All USB devices, all hard drives, optical drives, peripherals, everything but the keyboard mouse and screen. Then see if you can get into the BIOS screen. If that works start reconnecting things one by one and see what happens.
    i7 6700K, 16Gb DDR4RAM, 512GB M.2 SSD, Gigabyte GTX980

  10. #10
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    Default Re: Custom PC will not Power On

    Did it turn on / post before??

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