Quite possibly it was the "power good" signal from the power supply not coming up in time, or some piece of hardware not responding properly to the initial "reset" signal.
The reset problem can be the result of some connection becoming dirty, loose, or oxidized over time. As a preventative measure you can open the computer and make sure all cables are snug and wiggle all cards and RAM sticks in their sockets to help ensure good contact.
If it's the result of a bad signal from the power supply, it could be an indication that the PS is dying, but I wouldn't worry unless it starts happening more often.
While you have the computer open, blow the dust out of it.
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