Three loud beeps?

[BillG66]

I returned from lunch today, and when I woke up my Hack (Gigabyte MoBo), I heard three loud beeps. Did some Googling... CPU Temperatures and fan RPMs seem okay (see attached). Any thoughts on what that was, and whether I should be concerned?

 

[BreBo]

I returned from lunch today, and when I woke up my Hack (Gigabyte MoBo), I heard three loud beeps.

What does BIOS beep sound mean?

 

[BillG66]

What does BIOS beep sound mean?

Thanks, and please forgive my question if it's kind of "duh," but if it was Bios-related, wouldn't I hear it at startup rather than on wake? Isn't the Bios function done once the OS loads?