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.
Before I could save my Word doc, the computer just totally shut off, unlike what would have happened for a normal Windows shutdown. 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.
Went straight into UEFI BIOS, CPU temps look OK (at 41 deg C), which means overheating should be ruled out.
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".
This is really very creepy..... 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.... Immediately disabled them too.
I need some advice and ideas for what else could have caused this, and how should I go about trying to find out the trigger for the last shutdown.
Thanks very much... I'm trying to see if I got inadvertently hacked (even though I consider myself rather good around computers), or was it a hardware/software fault which can be rectified (thus eliminating a larger part of my worries). I'm not too sure if my network is secure or not though, and that could have been the reason for allowing a hack through, even though I'm on a shared dynamic IP provided by ISP.
Specs if you are curious:
- Gigabyte Z97-D3H
- Intel i7-4790
- G.skill 4x 4GB 2133MHz
- Sapphire R9-280X
I guess the rest shouldn't matter.