Computer starting automatically

[streety]

Hi there
I'm working on a Dell Precision T3500 with Linux MInt 19 Cinnamon and have a strange problem. My computer is self-starting every morning at 8:00. I looked at the bios - the power-on-options are disctivated. I don't know about cron-jobs - is it possible to check if there's something under the hood explaining this strange behaviour?

[capivara]

It should be a BIOS setting under "Power Management / Auto On Time.

[MtnDewManiac]

Is there a separate option regarding what to do after a power failure? (My mother's air conditioner has that ) and, if so, is the electricity being turned off at night and turned back on at 0800, perhaps as a money-saving thing with the company?

The computer shouldn't be able to turn itself on unless the BIOS menu (or what passes for it on newer motherboards) allows it. Unless you have a malfunctioning switch, but that would give random power-ups (and -downs), not something that follows a schedule.

Set up a webcam, maybe the cleaning staff (et cetera) is having a bit of fun with you.

Regards,
MDM

[all41]

You could also check if wake on lan is enabled is bios.
If so try disabling

[JoseLagasse]

Are you on bios option, if you are on the bios option then scroll down your cursor to the wake Lan.
After this simply shut your computer down and again restart it I think your problem will get solved soon.

[sgtor]

I used to have these problems and it could always be solved and permanently fixed on Linux.

On windows I would fix it then windows would add something to the autostart scripts on one of their infamous updates and my computer in my bedroom would wake itself and myself up at 3:00am. I suppose one of these days I should stop window bashing... but whatever. lol

Back to Linux, one of the things that was happening to me was a slight breeze from my window was moving the mouse and waking it up, that's probably not your problem though but it's worth mentioning for anyone else that might have the same problem.

You say you work on the computer so I assume it's an office computer. I think someone is messing with you and sending a wake signal over the LAN.

All of these other replies are good ones and you check those as well. Also try this and see what it shows.

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cat /var/log/syslog | grep -i "wake requested"

Edit:
almost forgot try this too.

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sudo hwinfo | grep -i wake

if you need hwinfo

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sudo apt install hwinfo