If the monitor didn't restart, that suggests a PSU issue. Again. (It was replaced following the move in Sept last year.)
This entry was originally posted at http://lovingboth.dreamwidth.org/486922.html, because despite having a permanent account, I have had enough of LJ's current owners trying to be evil. Please comment there using OpenID - have and if you have an LJ account, you can use it for your OpenID account. Or just join Dreamwidth! It only took a couple of minutes to copy all my entries here to there.