I immediately suspected remote shutdown via network, but because this is a home network and everyone else is asleep, it could be possible that someone initiated a shutdown remotely through my Dynamic DNS address.

Started Windows, went into Event Viewer, couldn't find any Shutdown events under Windows Logs > System at all, except those like 'The previous shutdown was unexpected'. Went straight into UEFI BIOS, CPU temps look OK (at 41 deg C), which means overheating should be ruled out. I couldn't start the computer again (sometimes not making past POST, sometimes beeping and immediately dying) despite multiple tries (switching the mains off and on), until I disconnected the network cable - which started my suspicions. Just 15 minutes ago, while on Windows 7, my desktop unexpectedly initiated a shutdown (Word prompted me to save my document, the Force Shutdown dialog came up), but I had not initiated any form of shutdown, and neither was Windows Update prompting an update.īefore I could save my Word doc, the computer just totally shut off, unlike what would have happened for a normal Windows shutdown.

Windows 7 shutdown