For my first post here I thought I would share this. I got a new 27inch iMac 5K that was released during WWDC this last Monday, and have realized that Macs signatured boot up chime is missing like the new MacBook Pros. My mid 2015 15inch MacBook Pro still has the normal famous boot up sound upon power on. I suppose with new lines of Apple Macs Apple is slowly phasing out the startup chime, something that I will greatly miss from older Macs. like my 2014 MacBook Pro. Does anyone here know a way to perhaps turn this signature feature back on so my iMac plays the startup time again, perhaps through a terminal commands? Also, let me know if this is also persistent with 21.5inch iMac models that just came out for 2017, as well as new updated MacBooks and even MacBook Airs.