My girlfriend's Macbook Pro arbitrarily decided to start beeping periodically. ➭ The sound is a pretty loud 'system' beep. ➭ Each beep occurs exactly 60 seconds after the previous one. ➭ The beeps are not very short. Each one lasts for 0.2-0.4 secon ➭ The beeps are low octave B notes, not that that little factoid would help with anything, lol. ➭ Nothing was being done on the computer when this happened. It was powered on but not in use and running few applications. ➭ Issue persists when Macbook is closed, in sleep mode. I know Mac's have beep codes, but I can't find a list anywhere to troubleshoot the issue- any assistance would be appreciated, cheers!