I have an Asus N56VZ laptop which recently started to cut off the power after precisely 30 minutes after it is turned on.
By cutting off power I mean it does not properly shutdown, but rather one frame it's working normal, and the next there's no power, after which it may be turned on by pressing the button, and it works as if nothing happened, until the next 30 minutes pass.
As far as I am aware, the only change to it since it was bought was doing a clean installation of Windows 10 instead of the Windows 7 installation it came with (including removing the OEM partitions).
The issue is not relevant to software as far as I can tell - it happens in said Windows 10, it happens if I boot to Linux from a DOK, and most importantly - it happens also if left in the BIOS.
I updated the BIOS to the latest version available from 2013, played with BIOS settings, changed to a different BIOS battery (which incidentally also reset the BIOS to its initial state).
I detached everything that I could and ran it with no battery, HDD, modem, and CDROM.
So far the only reason that I found online for this kind of behavior is Intel's Management Engine, however I can't find any way to even check anything related to that on the software side, and to my understanding it should only cause issues if hardware was changed, while as stated, only software changed.
Are there other causes that I am not aware of? Like some weird motherboard-is-going-to-die thing? Would love to know if this laptop is fixable.