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turning it off and on again seemed to resolve it for now
The first thing I learned about computer science back in the early 70s was the difference between a bug and a glitch. What you described is most likely a glitch, and aside from having back ups, the only thing you can do is wait for it to happen repeatedly so that you can try to diagnose it as a bug.
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If this is a desktop PC this is usually the point where I would give it a clean and just ensure all cables are seated securely, and to remove and reseat RAM, and if it's much older to consider refreshing the heatsink paste.
At the very least, were it to recur I would have already removed all of the most likely causes of it and it would aid better debugging.
Additionally... time to download the motherboard manual if you have not and to figure out what POST LEDs exist on the board.
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gbj_tester
Velocio
@branwen
My PC failed to get past the MB boot screen this morning. Fortunately turning it off and on again seemed to resolve it for now.
Beyond backing things up, is there anything else I should do? Are there any diagnostic tools that might be useful to run to try and narrow down what the issue might be?
(Been a long time since I've thought about PC parts)