Computer issues booting and waking from sleep, MOBO or PSU?

Hey guys so I have a PC that is having issues for some reason booting up or waking from sleep, when its been in sleep mode for more than an hour. Other things its been doing:
-LEDs and fans spin up and GPU lights up when I press the power button for a few seconds but then it turns off for a few seconds and back on, and keeps repeating til I shut it off manually.
-Having problems finding boot device, sometimes it tells me it cant find one or it gives me the black screen with the single "_" blinking.
Aside from that, when the computer is on, it works like a dream, no issues. I have checked the RAM, and made sure to unplug and insert all of the SATA connections, and still no change. Im worried its the motherboard but I would like to confirm before I purchase a new one, but Im alsos suspect of the PSU.
-My specs are: Gigabyte Z170x Gaming 3 Motherboard, 16GB DDR4 RAM, MSI GTX 970 4G, i5 6600k, Coolermaster heatsink, and an EVGA 500W Power supply unit

Any help would be GREATLY appreciated, thanks guys
Reply to apkochheiser
12 answers Last reply
More about computer issues booting waking sleep mobo psu
  1. I have the same problem .. There is a good chance it's the mobo as my gigabyte GA-z97-SOC has the same issue and it wasn't my psu cause I tried other one. Of course I did so many steps to troubleshoot it disconnecting everything like graphics card, hdd & optical drives, usb devices and testing with 1 stick of ram (I have 2 sticks of ram), however this hasn't changed anything at all.

    It started like you not booting up from first time and keeps restarting until It finally boots and also got stuck when waking from standby (I use hybrid sleep so when I turn the power off from the power switch, it resums from hibernation which means that the system never really started waking up when it crashed cause if it did, the hibernation file would be gone) .. I thought it's the psu and ignored the issue cause when it works, it really works and is completely stable under high loads.
    I only started troubleshooting the issue after about 2 months when I started spending hours trying to get it to boot/post. after reading the manual, and looking at mobo leds, I found out that it does keep switching between main bios and backup bios until it sparks! (posts and codes start showing on its debug led). What makes it spark is unknown. I kept trying to find any pattern to no avail.

    so I am planning to get a new mobo very soon. as now I could spend a whole day for it to spark. it's worth noting that I never did any overclocking and always used the optimized defaults values as it is. I bought it 3 years ago.

    Does the problem sound familiar ?? It drove me crazy trying to debug it especially I didn't do so until it would keep restarting forever until it posts. I even tried flashing the bios using qflash bios utility which made no difference but after that, the few times the mobo posted was actually using the backup bios. I replaced the battery too and reset the cmos values more times that I could count.
    Reply to flash_101010
  2. flash_101010 said:
    I have the same problem .. There is a good chance it's the mobo as my gigabyte GA-z97-SOC has the same issue and it wasn't my psu cause I tried other one. Of course I did so many steps to troubleshoot it disconnecting everything like graphics card, hdd & optical drives, usb devices and testing with 1 stick of ram (I have 2 sticks of ram), however this hasn't changed anything at all.

    It started like you not booting up from first time and keeps restarting until It finally boots and also got stuck when waking from standby (I use hybrid sleep so when I turn the power off from the power switch, it resums from hibernation which means that the system never really started waking up when it crashed cause if it did, the hibernation file would be gone) .. I thought it's the psu and ignored the issue cause when it works, it really works and is completely stable under high loads.
    I only started troubleshooting the issue after about 2 months when I started spending hours trying to get it to boot/post. after reading the manual, and looking at mobo leds, I found out that it does keep switching between main bios and backup bios until it sparks! (posts and codes start showing on its debug led). What makes it spark is unknown. I kept trying to find any pattern to no avail.

    so I am planning to get a new mobo very soon. as now I could spend a whole day for it to spark. it's worth noting that I never did any overclocking and always used the optimized defaults values as it is. I bought it 3 years ago.

    Does the problem sound familiar ?? It drove me crazy trying to debug it especially I didn't do so until it would keep restarting forever until it posts. I even tried flashing the bios using qflash bios utility which made no difference but after that, the few times the mobo posted was actually using the backup bios. I replaced the battery too and reset the cmos values more times that I could count.

    So it does found familiar, I havent noticed any spark however. But what i did notice researching was that people who had similar problems often had Gigabyte boards. And what I noticed helped to start it on was to turn the PSU off, and hold the power button for 10 seconds then turn the psu back on and the computer would start up
    Reply to apkochheiser
  3. when I said it sparks, I didn't really mean it .. no actual sparking happening .. I just keep trying too much to make it post until it feels like you are trying to make fire by sparking two stones :/
    Reply to flash_101010
  4. flash_101010 said:
    when I said it sparks, I didn't really mean it .. no actual sparking happening .. I just keep trying too much to make it post until it feels like you are trying to make fire by sparking two stones :/

    Oh haha I see, well I will keep digging, in the meantime my best guess is a faulty motherboard :( Im updating drivers as we speak so we shall see
    Reply to apkochheiser
  5. apkochheiser said:
    Oh haha I see, well I will keep digging, in the meantime my best guess is a faulty motherboard :( Im updating drivers as we speak so we shall see

    well drivers have nothing to do with booting up after shut down. At this stage drivers never come into play.
    Reply to flash_101010
  6. flash_101010 said:
    apkochheiser said:
    Oh haha I see, well I will keep digging, in the meantime my best guess is a faulty motherboard :( Im updating drivers as we speak so we shall see

    well drivers have nothing to do with booting up after shut down. At this stage drivers never come into play.



    Then no clue man, Im lost, Im hoping its fixable
    Reply to apkochheiser
  7. http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems
    try the troubleshooting steps at the above link, I almost did them all but didn't remove the board completely cause I am sure it doesn't short with the case because it actually works from time to time. Also flash the bios when you do everything else but it's a risky operation, however the risk is less because you have backup bios to revert to.
    For me, I am almost certain that it's mobo issue. I was going to make a post then I saw yours. I even get the blinking (-) sometimes.
    Reply to flash_101010
  8. I also think there is no need to mess with the processor at all because it's not a new build.
    Reply to flash_101010
  9. Let me know how it goes .. I have already bought a new mobo but want to know if there is still a little hope for the old one. Flashing the bios should be the fix if it's fixable after you get sure it's the mobo.
    Reply to flash_101010
  10. update: It turned out to be the cpu ! the motherboard is fine.
    Reply to flash_101010
  11. flash_101010 said:
    update: It turned out to be the cpu ! the motherboard is fine.


    How did you figure that out?
    Reply to apkochheiser
  12. apkochheiser said:
    flash_101010 said:
    update: It turned out to be the cpu ! the motherboard is fine.


    How did you figure that out?


    The cpu didn't work on the new mobo. then I tested another cpu on my old mobo and it worked confirming that mobo is fine.
    Reply to flash_101010
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