dnzr wrote:
The volume icon in the menu bar
I see—sound volume.
Change the sound output settings on Mac - Apple Support
Get help if the internal speakers on your Mac don't make sound
Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379
Try resetting the SMC https://support.apple.com/en-us/HT201295
if no resolve— To trouble shoot further you can:
—Try a SafeBoot https://support.apple.com/en-us/HT201262
Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login and test. Reboot and test as caches get rebuilt.
In Safe mode third party system modifications and system accelerations are disabled, it removes malware, etc hampering smooth operation, however a reboot will put it back to normal mode.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
—Test issue in another user (or guest user) account https://support.apple.com/en-us/HT204443
This will tell you if it a universal issue or isolated to your user/admin account.