[HELP] PC turns on by itself every few minutes and shuts down instantly

barraccuda · Jul 18, 2015

Greetings.
I got into a very strange situation. My uncle got a PC (DELL Optiplex 755), that keeps turning itself ON and then instantly turns itself off.
And by that I mean BY ITSELF it POWERS ON from a shut down state (not hybernated, not sleep mode... it is normaly Shut Down from within the Windows Vista start menu (yes I have configured the button to Turn Off the pc and not put it into a zzzz mode

) )

like every few minutes at random times if just powers on, then turns off instantly, it runs for like 1sec or so, it happens even before the LCD/BIOS gets initialized/booted.

Anyone got a clue what sort of trickery is that

btw. when I shut down the pc manualy by holding the Power Buttom for 5seconds the PC wont do this weirdness.
It happens only when it is turned off from withing Windows.

Tradesman1 · Jul 18, 2015

Might check if there is a BIOS update, but sounds like the mobo itself or the PSU is going bad

Kisianik · Jul 19, 2015

Your motherboard is dying, I trowed away my old XPS over that, backup all you need ASAP, your next power off may be your last one!

barraccuda · Jul 19, 2015

Tradesman1 :

Kisianik :

Could it not be an issue with some BIOS settings? Issue is not even a correct word in that case, rather just a matter of how the BIOS is set up.

I was browsing today once again thru the BIOS and found this:

(sorry for the blurry image, my hands are shaking like old man's /facepalm)
This is found in a MBEx BIOS settings.

Currently the standard BIOS setting has the Power Management set to S3 state.

But I have no idea what is this MBEx all about, so maybe it has nothing to do with powering on the pc.

btw. if you need a more clear picture let me know I will take another shot at better quality (hopefully)

Because otherwise the PC is running totaly fine and stable when I power it on and boot into windows. There are no crashes or BSODs or w/e... the pc does this On/Off powering only when shut down.
That's why I am not sure if it is really some MoBo/PSU failure, but only some hidden setting or something.

Kisianik · Jul 19, 2015

For better help, I would strongly advise you to join Dell Community forums http://en.community.dell.com/support-forums/desktop/f/3514 and write there your 2 posts from here, you have more chances to get correct answer there, for the blurry part, just type what is highlighted, no need to make better picture.

Just drop a link here, so we can follow up.

barraccuda · Jul 20, 2015

I gonna post that on the DELL forums definitely, good hint!

btw. I took today some more accurate pics from the Intel MBEx menu

and this is how the Power Management is set-up in BIOS settings

Kisianik · Jul 20, 2015

Dell Community will make more sense of BIOS abbreviations. I, personally, turned off any type of hibernation/sleep on my Dell PC, I don't care about electric bill, but a PC readiness when I need it.

barraccuda · Jul 23, 2015

So I made a post on the Dell forums, hopefully I will get some answers soon.
leaving a link here for refference, just in case someone will solve it on dell.
http://en.community.dell.com/support-forums/desktop/f/3514/t/19642153

Thanks for the hints and help so far folks.

Kisianik · Aug 2, 2015

Hey
Did DELL-Rishi suggestion at Dell community forum helped?

barraccuda · Aug 10, 2015

Kisianik :

Hi, sorry for late reply...
I have been away for several days so I could not finish the "work" on that pc,
meanwhile uncle took back the pc, so this puzzle remains unsolved :s

One thing I have tried was disabling the GPU driver in HW Manager, but that did not fixed anything...
then I tried removing the GPU driver ... but same result.
I did not got to the BIOS upgrade part, etc.

Thanks for help anyways folks.

b.

Kisianik · Aug 10, 2015

barraccuda :

Kisianik :

Hi, sorry for late reply...
I have been away for several days so I could not finish the "work" on that pc,
meanwhile uncle took back the pc, so this puzzle remains unsolved :s

One thing I have tried was disabling the GPU driver in HW Manager, but that did not fixed anything...
then I tried removing the GPU driver ... but same result.
I did not got to the BIOS upgrade part, etc.

Thanks for help anyways folks.

b.

Wait a bit, your uncle will be back....LOL

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[HELP] PC turns on by itself every few minutes and shuts down instantly

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