[SOLVED] PC turns on a split second and turns off

[ArthurMorgan1022]

I have looked at a bunch of forums trying to figure out what the issue is here, but it seems that no one has quite the exact same problem..

What's happening is when I try to start the computer, it turns on and shuts off immediately. Case fans, CPU fan, GCard fan, case LEDs and PSU fan all turn on for that half second. If I press the power button again, nothing happens..

The only way I can get it to attempt to startup again is if I flip the power supply off and on again, but it still does the same thing. Oddly, if I try it over and over again enough times, it will eventually boot and run. I can restart the computer from Windows and it restarts fine, but if I shut it on and off it still has that same issue. It has come down to flipping my power supply on/off a hundred times trying to get it to start with it eventually working.

This happened randomly after owning my computer for about 5 months, nothing changed whatsoever, I just tried turning it on one day and it happened. I'm not sure if it's just me but it seems to be getting worse and worse. I have tried different outlets, cleaning out everything, and unplugging all other cords except the power cord. It's not the power button itself either..

A strange thing that happens is if I turn my PSU off, unplug it, turn it on, and push the power button, it will do the split-second turn on. If I turn the PSU off and on again after that, when I push the power button it will run everything for about three times longer than usual (about a second).
Gigabyte B85M-D3H motherboard
I5 4570 processor
Rtx 2060 oc edition
Ant Esports FP750B psu
16gb ram

 

[Lutfij]

Welcome to the forums, newcomer!

You will need to source a reliably built PSU for that system. I actually did a Google search thinking that maybe you made a typo with an Antec unit. Turns out there is a brand named Ant Esports. Try and source a reliably built PSU by Corsair or Seasonic and one with at least 650W of power for the entire system. You can ask your friend or neighbor for the unit(if they own one) and see if the issue persists.

You might also want to call in a certified electrician to scope the wiring in your crib. I'm suspecting you have a grounding issue as well.

What BIOS version are you currently on for your motherboard?

 

[PanCase]

I think that you need to first check the health of the power supply.

 

[ArthurMorgan1022]

Welcome to the forums, newcomer!

You will need to source a reliably built PSU for that system. I actually did a Google search thinking that maybe you made a typo with an Antec unit. Turns out there is a brand named Ant Esports. Try and source a reliably built PSU by Corsair or Seasonic and one with at least 650W of power for the entire system. You can ask your friend or neighbor for the unit(if they own one) and see if the issue persists.

You might also want to call in a certified electrician to scope the wiring in your crib. I'm suspecting you have a grounding issue as well.

What BIOS version are you currently on for your motherboard?

I don't know about the BIOS version... And the psu is only 2 months old and it's a 750w psu
If I keep turn off and on it will eventually work
And back to this condition after shutdown
Now my bios is corrupted and i have to trigger backup bios this time
It's like Kickstarting my pc

 

[Paperdoc]

I fully agree with above. The system may be only a few months old, but your symptoms certainly suggest the PSU has failed and needs replacement.

 

[ArthurMorgan1022]

I fully agree with above. The system may be only a few months old, but your symptoms certainly suggest the PSU has failed and needs replacement.

But I tried paperclip test and it works perfectly

 

[MJS WARLORD]

have you tried running anything else from the wall socket that the pc is plugged into

 

[Paperdoc]

"But I tried paperclip test and it works perfectly." Not sure what you mean there. The "Paper clip test" normally is: you short out two particular lines of the 24-pin main PSU output connector to the mobo, and see if the PSU starts up and runs its fan. If that is what you did, the PSU managed to start up with almost NO load on it at all! The symptoms you describe says it usually does start up very briefly, but quits almost immediately because it can NOT supply enough power for a normal startup load. The Paper Clip Test does NOT prove the PSU is ALL good. It only proves it is not dead!

This still says the most likely culprit is a failed PSU.

I'll just mention one other small possibility for you to check. All mobos pay special attention to the CPU cooling fan for possible failure. They watch the CPU_FAN header for the speed signal coming to it from its fan. IF that speed signal is too slow or not there at all, it calls that a failure and puts an alarm on your screen. Beyond that, SOME mobos will take fairly quick action and shut down your entire system even before the temperature sensor inside the CPU chip can detect a high temp. ALSO, such mobos may refuse to let you boot up IF it fails to detect a CPU_FAN speed signal immediately on start-up. SO, check the connection between your CPU cooling fan and the CPU_FAN header. First, if you do NOT have anything plugged into that header, some adjustment will be needed to fix that. But if there IS a CPU cooling fan plugged in there, unplug it with your system OFF. Examine the connector carefully for any loose connection. Then plug it back in. Unplug and re-plug several times. This MAY "scrub" oxidation from the metal contacts and re-establish good contact. Try once again to boot up and see if that makes any difference.

 

[ArthurMorgan1022]

"But I tried paperclip test and it works perfectly." Not sure what you mean there. The "Paper clip test" normally is: you short out two particular lines of the 24-pin main PSU output connector to the mobo, and see if the PSU starts up and runs its fan. If that is what you did, the PSU managed to start up with almost NO load on it at all! The symptoms you describe says it usually does start up very briefly, but quits almost immediately because it can NOT supply enough power for a normal startup load. The Paper Clip Test does NOT prove the PSU is ALL good. It only proves it is not dead!

This still says the most likely culprit is a failed PSU.

I'll just mention one other small possibility for you to check. All mobos pay special attention to the CPU cooling fan for possible failure. They watch the CPU_FAN header for the speed signal coming to it from its fan. IF that speed signal is too slow or not there at all, it calls that a failure and puts an alarm on your screen. Beyond that, SOME mobos will take fairly quick action and shut down your entire system even before the temperature sensor inside the CPU chip can detect a high temp. ALSO, such mobos may refuse to let you boot up IF it fails to detect a CPU_FAN speed signal immediately on start-up. SO, check the connection between your CPU cooling fan and the CPU_FAN header. First, if you do NOT have anything plugged into that header, some adjustment will be needed to fix that. But if there IS a CPU cooling fan plugged in there, unplug it with your system OFF. Examine the connector carefully for any loose connection. Then plug it back in. Unplug and re-plug several times. This MAY "scrub" oxidation from the metal contacts and re-establish good contact. Try once again to boot up and see if that makes any difference.

Turns out mobo is the culprit

 

[Paperdoc]

Glad you've found that. I hope this means you actually have all the difficulties solved. Thanks for the update.