Question Computer will not sleep

[rettro]

After upgrading my mobo, cpu and RAM my computer will not sleep. After pressing sleep from the start menu it will go to sleep for about 3 seconds and will automatically wake up on its own. I have tried almost every option I could find on google including editing power plans, creating a new user profile, switching to a power saver power plan, going into the device manager and changing settings (multimedia sharing, mouse & keyboard, network adapters etc) to allow my computer to sleep, disabling wake timers altogether, using the windows power troubleshooter as well as using the command prompt to find out what last woke my computer (apparently nothing is waking my computer). I've just about had it and am about to pull my hair out. Can anyone please help?

 

[Colif]

Did you clean install windows after changing all of that hardware? as that is always a good starting place, Swapping an old install from previous hardware into new Mobo/CPU is just asking for problems.

did you update BIOS?

Which version of win 10 are you on?
right click start
choose run...
type winver and press enter
current versions are 1803, 1809 & 1903. Given age of PC you should be on 1903

 

[rettro]

Yes this was all following a clean install of Windows 10 Pro 1809. Bios is up to date as well.