A chap posted a comment on the front page with a similar “glitch”. I’ve not seen anything like that myself Im afraid. It is prob just worth checking your power management settings – had the machine been ideal for 5mins or so or did it happen in use?
Further to that – other readers might notice their machine turns off. I’ve just woken mine up and it appeared “off”. This is just “hibernation”. Turn the power back on and windows should “resume”. You will end up exactly where the PC was before it powered down.
That doesn’t sound like what you saw though!