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This sounds like it might be hardware failure, as the loud speaker is different from the in call speaker. When you're in a call, can you turn speaker mode on? Does that work?
The loud speaker should be functional then. Have you tried restoring to factory settings?
What about with headphones? Work then?
Next thing to try is download soundabout app, https://play.google.com/store/apps/details?id=com.woodslink.android.wiredheadphoneroutingfix&hl=en
Under Media Audio select Speakers, see if that works. If it does, the phone may think that headphones are plugged in when they aren't. Grab a blow dryer and turn it on low then aim it at the headphone jack about 6 inches away from the phone for 15 seconds. Make a test and you should have your sound back.
Certain apps have sound but others don't? Or all apps do, just no sounds from the operating system?
Try soundabout next and see what happens
Sounds like it thinks it's in Vibrate mode. In android when you're in vibrate it grays out volume controls for media
free, just testing
Hmm...ok. I'm out of ideas. Let's see if someone else can help.
For the com.google.android.music process to have stopped, there may be an Android OS system problem on your phone.
If so, then it could be owing to the Stagefright exploit. Here's some info about that possibility:
If the Android OS version on the device is not sufficiently updated, then it may contain a significant 'security hole' that allows almost anyone to gain access and control over your phone.
To test as to that security hole, download and use this app:
to tell whether there is such a security hole in your phone's Android operating system.
To avoid the problem in the first place, not just using the Stagefright detector, but also completely updating your Android OS ab initio when you first start using it, is a good idea.
(Some older versions of Android OS cannot be patched, by merely updating that version... but a higher version, if it can run on the older Android OS -compatible phone, can cure that problem.)
Having to select it and de-select it, signifies that something was wrong in the software. And if the Stagefright Android exploit is possible on your phone and caused it, your phone would be being hacked into and further problems may be expected... or, might already be present. So I advise checking on Stagefright, just in case and to be safe, at your convenience.
Thank you for consulting JustAnswer.com, and good luck.