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I recently built a new PC and installed all the Windows Updates, drivers and few applications as well. After that I shut down my computer and noticed that after half an hour the computer turns on automatically? I dont understand why is causing this issue? Does anyone know how to solve this problem? Thanks
It looks to be a BIOS settings issue. So just get into the BIOS and then check whether you have the wake on lan turned on or so. If you get a lan message then it might also turn on the pc. So try to disable that as well. Also check the wake on timer is not set. Also, if your keyboard is used by someone then it might also wake up the PC for sure.
This problem usually happens if there are some power fluctuation in your areas. So the best thing you can do to prevent this is to buy a UPS that will help you filter the power loss. It will be able to give you clean power for the PC usage. You can buy something like CyberPower Intelligent LCD Series GreenPower UPS CP1000AVRLCD 1000VA 600 Watt 5 x 5-15R Battery/Surge Protected 4 x 5-15R Surge Protected Outlets UPS for $112.99.
Can you try to disconnect the power buttons and check if that makes any difference. Also try to disconnect mouse and keyboard or any external hardwares. After that diable the auto restart in the Startup to show you a crash during shutdown. Also, as said before, disable any wake on lan features from the BIOS settings and check for any shorts as well.