Weird PC issue - Wont stay switched off.

Dave85

Dave85

Dave85

Soldato
Joined
18 Jan 2004
Posts
9,335
Location
Sunny Scotland
I have developed a strange issue with my system. Been working fine for 20 months nothing changed except change from 6800xt to 3080. It will not stay off. Turn off from windows pc shuts down. About 1 to 2 seconds later it clicks and then turns back on. If I hold down the power switch on the pc to force it off it will go off but will then not turn back on via the button. I turn it off at the PSU then back on and it instantly boots without me touching it. I'm thinking fault power button on p500a as otherwise its rock solid gaming etc so suspect its not a psu issue? Specs below and what I have tried.

Motherboard - Asus B450f-F Gaming II - Latest bios
Ram 32GB DDR 3200 2 x 16GB in slots 2 and 4
3080FE
PSU Corsair RM650X
WD BLACK sN750 m.2
Couple of sata SSD from Samsung.

Tried
  1. Reseated every component
  2. Removed unnecessary 10GB Nic.
  3. Reset cmos
  4. Reinstalled windows from scratch (win10)
  5. Checked the cables for button and front panel are installed correctly.
  6. Bunch of windows fixes and soft power adjustments in bios etc but all fine before fiddling with this so should not be the cause.
So I'm thinking stuck button but then possibly PSU as even if the power button is disconnected as soon as I plug it in the pc boots immediately even when set to power off in bios from power loss. Any ideas as someone on another forum mentioned possibly power management issues with the motherboard.

Possibly PSU bit underpowered for the 3080 vs my 6800xt as I have heard the 3080 can be fussy.
 
Last edited:
Whilst it's plugged into the mains, run your hand over your case (metallic parts). Do you feel a "buzzing" sensation on the case? This could be a sign of a short that could be a cause of such a problem. (I've experienced this before).

Another thing to check, is to remove all extrenuous USB devices. Leave only the bare essential keyboard and mouse. I've previously found that a USB device was causing problems, starting up, shutting down, restarting. So it'll be a good idea to eliminate such possibilities first.
 
Thanks just checked this. Could not feel any sensation and I have dry hands so usually get shocked from stuff at this time of year. Also removed all USB devices except keyboard and mouse and tried different slots. Reinstalling Windows again to 11 might as well try it before looking at hardware
 
Do you play games like Civ or Total War? this is the PC enforcing just one more turn upon you.

I am thinking a short like Monk suggests. Reinstalling BIOS could be an idea if thats not something you have already done.
 
Is your system actually turning off? Check task manager to see the up time on your CPU. If it's hundreds of hours your PC isn't properly shutting down.

I watched a YouTube short on how to fix it. It was quick and easy and my PC actually shuts down.
 
It only turns off if I hold down the power button to hard off. It will then not turn back on via the power button. Only will turn back on if I power off at psu. It then boots immediately once the psu power is turned on. Reinstalled latest bios just in case and fresh windows 11 install. Still the same. I then removed the power button cable as suggested shut down the pc. Same thing shuts off then boots. Removed the reset switch cable as well same thing. Only option left is as suggested and rebuild outside the case to check for a short
 
Okay removed everything from PC. Parts all on cardboard box still does it with only the PSU connected GCARD and mouse. Thinking possibly a faulty motherboard power control?
 
3600x so no cpu graphics. Going to do some more troubleshooting tomorrow with lads GPU and powersuppy to confirm its the mobo. Will try his ram etc even though slower its worth a bash to confirm mobo. If it is then its upgrade time hah been looking for an excuse. i5 13600 and z790 time.
 
Last edited:
For what its worth, I got a PC that keep turning itself back on too!

Its an older Gigabyte Z270 with a 7700K in it.
It never used to, but now it does kind of thing, and I have goine through everything that I can possibly think of.
I even went back to the very basics and when I bought his PC, And one of the things I do have, is the original BIOS, and so I flashed it with the original BIOS and Viola - it now doesnt start up.

Ok, it does but only when I press power.
So, based on this, I wrote down everything that I can find in the BIOS pages, and what is set to what and there is nothing that I can find that is different that will force the thing to start up, but on the newer BIOS it wont stay off and on the older BIOS, it does!
All power management setting being the same on both BIOSes, and I have manually change them just in case there was a setting that shows one thing but its really another.


So, yeah, try a different BIOS?
 
You must log in or register to reply here.
Back
Top Bottom