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Computer Turns on and off repeatedly

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  • Computers
  • Motherboards
  • Components
Last response: in Components
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November 27, 2013 6:05:45 AM

I just replaced my motherboard of the same model:
GIGABYTE GA-Z87X-D3H INTEL Z87 CROSSFIREX/SLI SATA 6
My old one's USB and on-board audio broke. I plugged everything back into the motherboard, but my computer turns on and off repeatedly. All of the fans spun (GPU, CASE, and PSU) and heard the hard drive boot up, but then all of a sudden it turns off. Three seconds later, it turns back on again, and repeats the on and off cycle. My monitor doesn't receive a signal.

I am not sure why this is happening. But, here's some information on my specs:
My PSU is: THERMALTAKE SMART SERIES SP-850M 850W 80PLUS BRONZE
I bought my motherboard in America, but I am in Japan and bought a new one here (not sure if this makes a difference, but maybe there is a power difference in the motherboards that I don't know about?)

Maybe it could be the power supply is too low for the motherboard? Is it my CPU that causes the power to shut off and on?

This is a first time to replace a new motherboard, and I didn't experience the on and off when I used my old motherboard. Are there suggestions that I can do to fix this?

More about : computer turns repeatedly

a b V Motherboard
November 27, 2013 6:20:17 AM

best way to check is to unplug everything unneccesary. Take out the GPU, only use 1 stick of memory, unplug all non boot hard drives, and all optical drives, and see if it boots. If so then slow start pluging things back in to see what might be the issue. If you still have the issue also try reseating your CPU (take it out of socket, put it back in)
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November 27, 2013 9:46:07 PM

I checked all cables and they seem to be all connected. I took out everything except the CPU, but I left all cables connected to the mobo. Even then, it still doesn't work. I checked the CPU, and saw some bent pins on the new mobo CPU socket. I fixed them to its correct spot. Yet, the computer won't turn on completely. Is it a CPU problem? My old mobo seemed to work fine (turn on completely). Or, did I wire everything incorrectly?
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November 27, 2013 9:46:09 PM

I checked all cables and they seem to be all connected. I took out everything except the CPU, but I left all cables connected to the mobo. Even then, it still doesn't work. I checked the CPU, and saw some bent pins on the new mobo CPU socket. I fixed them to its correct spot. Yet, the computer won't turn on completely. Is it a CPU problem? My old mobo seemed to work fine (turn on completely). Or, did I wire everything incorrectly?
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a b V Motherboard
November 27, 2013 9:48:58 PM

To check:

Plug 24pin
plug 4pin CPU
insert cpu, memory.

check if it would boot to bios.

reply once done.
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November 28, 2013 6:14:30 AM

Okay, I left the 24pin, CPU cables in, none of the other cables connected to it. They still don't work. I did the paperclip test on the 24 pin cable, where the PSU's fans ran for a long time. When I plugged the 24pin and CPU cables into the motherboard, the on & off symptoms still occurred. I did not plug in any other cables into the PSU.
Here's what it looked like:

Case fans were off
No HDD/Power light on the case turned on
The PSU fans were running
CPU heatsink was working/buzzing

Results:
Turned on for 10 seconds, then off for 5 seconds, and on and off and on and off

It is almost the same results if I plugged everything into the PSU.

Would it be a CPU/Motherboard issue?
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Best solution

a b V Motherboard
November 28, 2013 6:16:44 AM

Brycidium said:
Okay, I left the 24pin, CPU cables in, none of the other cables connected to it. They still don't work. I did the paperclip test on the 24 pin cable, where the PSU's fans ran for a long time. When I plugged the 24pin and CPU cables into the motherboard, the on & off symptoms still occurred. I did not plug in any other cables into the PSU.
Here's what it looked like:

Case fans were off
No HDD/Power light on the case turned on
The PSU fans were running
CPU heatsink was working/buzzing

Results:
Turned on for 10 seconds, then off for 5 seconds, and on and off and on and off

It is almost the same results if I plugged everything into the PSU.

Would it be a CPU/Motherboard issue?


Best way to check that is to find another PSU for testing. If other PSU works then its the PSU if not then its the motherboard. Goodluck.
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November 28, 2013 6:29:58 AM

Okay. I tested with both the current 850w PSU I use and a 1000w PSU. They both passed the paperclip test, but when I plugged them into the motherboard cables only, they both had the same results of the computer turning on and off and then back on. I might need to buy a new motherboard, but I may have another possible reason in mind...

Could it be a short circuit? I thought I screwed the mobo on correctly, but could this cause the electricity to go to the case (not the mobo)?

The first motherboard (with audio and USB port issues) did work correctly with the same PSU and everything, but the second one (newer mobo) had the on-and-off issues.

I got back the first semi-buggy motherboard, and when I installed it to the case, it experiences the on-and-off. Is it possible I installed the motherboard incorrectly, causing the short circuit? Maybe the standoffs aren't placed correctly?
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a b V Motherboard
November 28, 2013 7:34:28 AM

Brycidium said:
Okay. I tested with both the current 850w PSU I use and a 1000w PSU. They both passed the paperclip test, but when I plugged them into the motherboard cables only, they both had the same results of the computer turning on and off and then back on. I might need to buy a new motherboard, but I may have another possible reason in mind...

Could it be a short circuit? I thought I screwed the mobo on correctly, but could this cause the electricity to go to the case (not the mobo)?

The first motherboard (with audio and USB port issues) did work correctly with the same PSU and everything, but the second one (newer mobo) had the on-and-off issues.

I got back the first semi-buggy motherboard, and when I installed it to the case, it experiences the on-and-off. Is it possible I installed the motherboard incorrectly, causing the short circuit? Maybe the standoffs aren't placed correctly?


You could remove your MB from the case and try to test it there. If it is still the case then it might be the MB itself.
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January 12, 2014 7:03:56 AM

So did this get resolved?

Having the same issue now!!

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October 4, 2014 9:24:18 PM

Brycidium said:
I just replaced my motherboard of the same model:
GIGABYTE GA-Z87X-D3H INTEL Z87 CROSSFIREX/SLI SATA 6
My old one's USB and on-board audio broke. I plugged everything back into the motherboard, but my computer turns on and off repeatedly. All of the fans spun (GPU, CASE, and PSU) and heard the hard drive boot up, but then all of a sudden it turns off. Three seconds later, it turns back on again, and repeats the on and off cycle. My monitor doesn't receive a signal.

I am not sure why this is happening. But, here's some information on my specs:
My PSU is: THERMALTAKE SMART SERIES SP-850M 850W 80PLUS BRONZE
I bought my motherboard in America, but I am in Japan and bought a new one here (not sure if this makes a difference, but maybe there is a power difference in the motherboards that I don't know about?)

Maybe it could be the power supply is too low for the motherboard? Is it my CPU that causes the power to shut off and on?

This is a first time to replace a new motherboard, and I didn't experience the on and off when I used my old motherboard. Are there suggestions that I can do to fix this?


I had this exact same problem. I solved my problem by getting an older CPU, and flashing the BIOS, then reinstalling my new CPU. All works fine now. My board is:exactly the same as yours, but I had a i5-4460 CPU, and it was way too new for the board. Could that be your issue?
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