How can I make my Macbook Pro's headphone jack stop "humming"? Switched recently from a Lenovo PC and one thing on my mac bothered me. Headphones plugged into my Macbook pro 13" (latest version) "hum" with static when there is no audio playing. Then after a short period of time, they stop humming, as if all power to the port is turned off. When any sound plays, it starts again. Anybody know of any setting in the Mac "bios" (or whatever they call it) or with drivers or software to get it to stop humming? It's rather annoying.
I found the solution to my problem. For some reason (who knows why) the headphone output was set to 16-bit. Of course that's going to sound awful.

To fix this, head to 'Audio MIDI Setup' (can be found with Spotlight) and change the 'Built-in Output' to 32-bits.