This has been bugging me for about a week now.
Every couple minutes my Rev D 12" PB will produce a faint grinding noise that sounds like it's coming from the left side of the keyboard. I've done the usual searches and there is something similar to what I am experiencing that is deemed to be normal ... but I got worried when the PB made the same noise
while sleeping. I've also heard it both with the power cord attached and when it's running on batteries.
I managed to record the sound down and wondered if anyone else knows for sure.
Click
here to hear what it sounds like.
Any input would be much appreciated.