No sound on certain desktops

There are three user profiles on my mac, but the sound only works on mine.  The other two (my parents' profiles) are completely silent.  I checked sound preferences and nothing is on mute and the volume is turned up to max.  Everything looks the exact same as the one account that is working.  There is not damage done, and the speakers aren't broken because they work perfectly on my account.  I've done all I know how to do and woulf love some help!

In your parents account.....
Repair permissions & restart. 
Troubleshooting issues with no audio from built-in speakers on Macs
Open up GarageBand if installed then, open a program (optional).
Quit out of the GarageBand app.

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