PC turning off

[Pingu]

Hey everyone,
My PC has recently been turning ON by itself at the most random times. Sometimes at like 4am my whole room will just light up red and the pc turns on and after a few seconds turns off by itself, and then this repeats until I go turn it off from the main switch. Same thing happened this morning, except when I try to turn it back on a few hours later it turns on for a few seconds and then switched off. I have tried to check and ensure that all cables are plugged in as well as reseat the CMOS battery but so far nothing has worked I swear this PC is driving me crazy.

Hope someone has the answer to this
Thank you!

[Bruce]

Let’s get your PC spec.

get Speccy from here; Speccy - Download Builds
in Speccy, click File > Publish Snapshot > Copy to Clipboard > Close.
now you can paste (Ctrl+V) that link into a post.

One component Speccy doesn’t cover is the Power Supply Unit, so please also include the make/model of the PSU.

[Pingu]

Unfortunately I can’t log into my pc as it is failing to boot. However, my PC specs are:
Intel Core i7-9700F
MSI MPG Z390 Gaming pro carbon
MSI NVIDIA GeForce GTX 1050ti
XPG Spectrix D60G DDR4 8GBx2 3600mhz
XPG Spectrix S40G 512GB m.2 ssd
2x samsung ssd…don’t know the model
Cooler Master V650 gold v2 PSU
Cooler Master MasterLiquid ML240R RGB

hope i got them all!

[Bastet]

The PC turning on can be due to Windows updates (they’re automatically set the 3am unless you change it)/maintenance settings.
However the failure to boot suggests that either the boot settings are corrupted/missing or the drive has failed. Can you reach the BIOS?
Can you boot from Windows installation media or any Boot USB?

[Pingu]

No, I can’t reach the BIOS. The PC turns on for a few seconds and then immediately turns back off and then after a little while repeats this on its own. I was thinking it was some issue to do with the power supply? If I remember correctly there is a setting in the BIOS that has something to do with automatically restarting when power is re-established? just an idea

[Bastet]

It may be a Motherboard fault.
I would try unplugging from the power supply, disconnecting all devices, remove the battery if a laptop, remove the CMOS battery & long press the on/off switch to dissipate any residual energy & leave things for 30 minutes. Then reconnect everything & see if the PC starts.

[Pingu]

I tried that this morning and it still did not work

[Bruce]

long shot, the front panel power switch isn’t stuck in at all?
you could double check that by disconnecting the front panel power button cable off the PWR SW header jumper pins on the motherboard.
then to start it, get a screwdriver or paperclip or such to short out those two pins.

[Bastet]

I tried that this morning and it still did not work

Did you do the steps exactly as I wrote?

[Pingu]

Yea I sure did

[Pingu]

I tried a new power supply, plugging in only the graphicsbcard, motherboard and cpu. Same thing happening

[Pingu]

So I took the motherboard out and installed the CPU, RAM, graphics card and M.2 ssd and it worked and booted. I then put the motherboard in the case and hooked up some usb, fans and front io ports and it booted once again. I then connected some other ssd and was trying to connect some more fans and lights into a back control hub when the pc randomly turned on and then back off. The EZ debug light showed up for the CPU. Any ideas?

[Bruce]

repeat that last exercise.

take it back to what did work and see if you can go back to that known good state.
then add those fans, SSD and lights again, if it fails after that, you have your answer as to what is causing this!

[Pingu]

Alright I’ll give it one last shot

[Pingu]

Now it’s not even working on the first level…