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Thread: Computer restarting on its own after shutdown




  1. #1
    genegold is offline Member
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    Default Computer restarting on its own after shutdown

    Starting about a week ago, my computer has begun to restart sometimes about two to three seconds after it has seemingly shut down (via Win 8.1 shutdown). I suppose it could be a start switch going bad, although in the three years I've had this Cooler Master case I've only recently begun starting manually, vs. powering from a console. Before I write Cooler Master about a replacement, if feasible, are there any other possibilities? Thanks,
    ASRock Z97 Extreme6 / Intel i7-4790K
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    Canon MP640 / Brother HL-2270DW printers
    Audio system: Dac + Powered speakers + USB card + LPS + power cond./distrib.
    Windows 10 Pro x64

  2. #2
    parsec's Avatar
    parsec is offline Senior Member
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    Default Re: Computer restarting on its own after shutdown

    I don't see BIOS (UEFI) U1h on your board's download page, so don't know what its features are, all I see is U1L. I assume U1H is a beta UEFI from @BIOS?

    Did you remove the Gigabyte utilities that are not compatible with the UEFI BIOS?

    Other mobo manufactures I've seen have UEFI/BIOS updates that include modification for "Windows 8 shutdown behavior", not sure if Gigabyte has anything similar.

    I would look into the power switch, I'm sure the part that contains the power button could be replaced.

    For a test, you could remove the cables from the power switch to the boards system header. Then start the PC by momentarily shorting the two pins that the power switch cables were connected to. Later shutdown the PC via Windows, and see if it remains off.

    What do you mean exactly when you say, "I've only recently begun starting manually, vs. powering from a console"? Starting the PC via the keyboard or mouse?

  3. #3
    genegold is offline Member
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    Default Re: Computer restarting on its own after shutdown

    Thanks for the ideas. I woke up this morning thinking it's unlikely to be the switch, since after cutting off it must be getting an electrical signal from somewhere. For BIOS instructions, you have to see the Z77-UD3H board manual. I haven't changed BIOS settings for awhile, but will have to check that. I'm wondering if the the power supply isn't the culprit, with some kind of signal being re-sent. Be interested to find out more about Win 8 shutdown behavior, if there's anything special. What I meant by powering from console is that up until recently I had the computer plugged into a console and the BIOS set to start with power. Since adding a good audio system and upgrading the wall outlet quality, the computer is plugged directly into the wall. That means manual start from the computer start button. Since late November.
    ASRock Z97 Extreme6 / Intel i7-4790K
    32 GB G.Skill DDR3 2133 RAM (Ares 4x8gb)
    EVGA GTX950 SC
    Prolimatech Megahalems Rev. C cooler w/ Nexus Silent Fan
    Seasonic X650 PSU
    Samsung Pro 850 256GB SSD (system drive)
    SanDisk ExtremePro 480, Seagate 1TB, 2TB and 2x 3TB SATA 6Gb/s
    Plextor PX-891SA CD/DVD Writer/Player
    Dell U2412M Monitor (1920x1200)
    IBM Model M keyboard / Bornd M120 wireless mouse
    Thermaltake F31 Case
    Canon MP640 / Brother HL-2270DW printers
    Audio system: Dac + Powered speakers + USB card + LPS + power cond./distrib.
    Windows 10 Pro x64

  4. #4
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    boondocks is offline Senior Member
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    Default Re: Computer restarting on its own after shutdown

    You have your signature showing a Z68 board, and you are talking about a Z77 board....not that it likely makes any difference.
    I doubt the manual switch is bad, anything's possible but I tend to doubt the switch. The symptoms of restarting right after shutdown seem more BIOS or OS related to me.

    Changed any BIOS settings lately? Installed any utilities?
    Have you tried reflashing the BIOS and loading optimized defaults?
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  5. #5
    genegold is offline Member
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    Default Re: Computer restarting on its own after shutdown

    It's interesting, I normally hold off posting a second place, but this time I didn't and have gotten very different thoughts/suggestions from each. Both are worth trying: 1) reflash the BIOS and 2) disconnect the cable modem before shutdown to test if it's sending a WOL signal. I also contacted Kingwin, the PSU maker, and they are looking into whether or not it could be their unit. As for boards, Gigabyte didn't update the Z68 manual when UEFI became common, so the pertinent info has to be drawn from their Z77's manual.
    ASRock Z97 Extreme6 / Intel i7-4790K
    32 GB G.Skill DDR3 2133 RAM (Ares 4x8gb)
    EVGA GTX950 SC
    Prolimatech Megahalems Rev. C cooler w/ Nexus Silent Fan
    Seasonic X650 PSU
    Samsung Pro 850 256GB SSD (system drive)
    SanDisk ExtremePro 480, Seagate 1TB, 2TB and 2x 3TB SATA 6Gb/s
    Plextor PX-891SA CD/DVD Writer/Player
    Dell U2412M Monitor (1920x1200)
    IBM Model M keyboard / Bornd M120 wireless mouse
    Thermaltake F31 Case
    Canon MP640 / Brother HL-2270DW printers
    Audio system: Dac + Powered speakers + USB card + LPS + power cond./distrib.
    Windows 10 Pro x64

  6. #6
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    Default Re: Computer restarting on its own after shutdown

    Hi there,

    noticed from your spec's that you're using a Dell monitor that has USB ports. Have you connected this to the PC via USB? If yes, try removing the USB cable as I found with my Dell monitor the same thing happening. Only stopped rebooting once I had disconnected the USB link.
    Chassis: Xigmatek Elysium - Mobo: GA-Z97X-UD5H - PSU: Gigabyte Odin 800 Watt Modular
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  7. #7
    genegold is offline Member
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    Default Re: Computer restarting on its own after shutdown

    DVI not USB. Note that I put this system together close to two years ago and this problem only developed in the past seven days or so.
    ASRock Z97 Extreme6 / Intel i7-4790K
    32 GB G.Skill DDR3 2133 RAM (Ares 4x8gb)
    EVGA GTX950 SC
    Prolimatech Megahalems Rev. C cooler w/ Nexus Silent Fan
    Seasonic X650 PSU
    Samsung Pro 850 256GB SSD (system drive)
    SanDisk ExtremePro 480, Seagate 1TB, 2TB and 2x 3TB SATA 6Gb/s
    Plextor PX-891SA CD/DVD Writer/Player
    Dell U2412M Monitor (1920x1200)
    IBM Model M keyboard / Bornd M120 wireless mouse
    Thermaltake F31 Case
    Canon MP640 / Brother HL-2270DW printers
    Audio system: Dac + Powered speakers + USB card + LPS + power cond./distrib.
    Windows 10 Pro x64

  8. #8
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    Default Re: Computer restarting on its own after shutdown

    Quote Originally Posted by absic View Post
    Hi there,

    noticed from your spec's that you're using a Dell monitor that has USB ports. Have you connected this to the PC via USB? If yes, try removing the USB cable as I found with my Dell monitor the same thing happening. Only stopped rebooting once I had disconnected the USB link.
    Quote Originally Posted by genegold View Post
    DVI not USB.
    I'm thinking absic was inferring if you have the monitors built-in USB hub connected back to the computer to disconnect it and see if your rebooting stops.
    #1 - Please, when seeking help, enter the make and model of ALL parts that your system is comprised of in your Signature, or at least the model #'s in your System Specs, then "Save' it.
    ____If you are overclocking, underclocking, or undervolting any parts, informing us of this and their values would prove beneficial in helping you.

    #2 - G.Skill RAM Configurator for your boardSamsung Memory for your boardLatest AMD Chipset Drivers/WindowsLatest AMD Graphics Drivers/WindowsLatest Intel Drivers

    #3 - Please use the eXtreme Outer Vision Power Supply Calculator found HERE to determine if it might be your PSU at issue.
    ____Consider your PSU to be the foundation from which all else is built upon. Anything built upon a weak foundation is poorly built.

  9. #9
    genegold is offline Member
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    Default Re: Computer restarting on its own after shutdown

    Thanks, but I don't use the monitor's USB hub. Not even sure I ever got them working, though there's no need.
    ASRock Z97 Extreme6 / Intel i7-4790K
    32 GB G.Skill DDR3 2133 RAM (Ares 4x8gb)
    EVGA GTX950 SC
    Prolimatech Megahalems Rev. C cooler w/ Nexus Silent Fan
    Seasonic X650 PSU
    Samsung Pro 850 256GB SSD (system drive)
    SanDisk ExtremePro 480, Seagate 1TB, 2TB and 2x 3TB SATA 6Gb/s
    Plextor PX-891SA CD/DVD Writer/Player
    Dell U2412M Monitor (1920x1200)
    IBM Model M keyboard / Bornd M120 wireless mouse
    Thermaltake F31 Case
    Canon MP640 / Brother HL-2270DW printers
    Audio system: Dac + Powered speakers + USB card + LPS + power cond./distrib.
    Windows 10 Pro x64

  10. #10
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    Default Re: Computer restarting on its own after shutdown

    I give. Your PSU, All I can seemingly find are your posts here and elsewhere when Googling "Kingwin LWP-550".

    Maybe LZG-550 or LZP-550 instead?
    #1 - Please, when seeking help, enter the make and model of ALL parts that your system is comprised of in your Signature, or at least the model #'s in your System Specs, then "Save' it.
    ____If you are overclocking, underclocking, or undervolting any parts, informing us of this and their values would prove beneficial in helping you.

    #2 - G.Skill RAM Configurator for your boardSamsung Memory for your boardLatest AMD Chipset Drivers/WindowsLatest AMD Graphics Drivers/WindowsLatest Intel Drivers

    #3 - Please use the eXtreme Outer Vision Power Supply Calculator found HERE to determine if it might be your PSU at issue.
    ____Consider your PSU to be the foundation from which all else is built upon. Anything built upon a weak foundation is poorly built.

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