"Ca't get any help from tech support: [...]Upgraded to 15.6 but issue is exactly the same as before. The Music app will not play anything on a cd when bluetooth headsets are used. As soon as headset connects, it cuts off the cd playing and nothing I do to start playing from cd will work unless I use QuickTime to play songs on the cd.[...]"
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Troubleshooting Music App:
So, when did this begin? How long have you troubleshot it?
Boot in Safe Mode:
(Hold Down: the shift key upon boot). In Safe Mode, login items do not load at log in, certain System Preferences are set aside, and damages system files (caches) are fixed. So, try that, and see if this issue is fixed.
No success?
A. Reinstall the macOS:
Activity Monitor is part of the macOS. So, one option would be to reinstall the macOS to fix any bugs in this app. Nothing would be lost. It's just that misplaced items would be placed back to where they should be and corrupt system files would be replaced by clean files. Go Here: Reinstall macOS - Apple Support. Boot into Recovery Mode (Intel or Silicon). Important: Prior to installing an update or performing a reinstallation, to prevent data loss, be sure to back up your Mac with Time Machine, that way, you can have something to restore your Mac from, should anything go wrong afterwards.
B. Restore form a Backup:
Did you ever create a Time Machine Backup of this issue, prior to getting this issue? If so, restore from it. If not, then take this as a learning experience, knowing to always create a backup, prior to making any major change to if, from a software installation to a security update installation.
C. A Bug in the Update:
It might be a bug in a recent update. Apple might come out with a fix, but they'll only know of this if it is reported Report this to Apple:
Do your Part: Report this to Apple. Apple may not get back to you directly, but the more feedback Apple receives on this, the more they will know what is going on, and what needs to be fixed in upcoming updates. These are just user-to-user forums. Apple's developers will know nothing of this issue, if you don't report it to them.
- Go Here: Feedback - macOS - Apple
- Select: "Bug Report" for the "Feedback Type"
- Comment: when this all started, and how you have troubleshot it thus far. Include the URL to this thread.
- Proceed from there as necessary