My in­ter­nal speak­ers fall si­lent

Mac Format - - SOS MAC -

I have a mid-2011, 27-inch iMac, run­ning Yosemite 10.10.3. When I restart or shut down my com­puter, my sound out­put set­ting changes away from us­ing the in­ter­nal speak­ers, which is not what I want. Is there a way to stop this hap­pen­ing? I don’t re­call this hap­pen­ing in pre­vi­ous ver­sions. Roy Lund

With Yosemite, the de­fault sound out­put changed to use an HDMI de­vice if one is con­nected. This means an ex­ter­nal mon­i­tor’s speak­ers are used au­to­mat­i­cally. On an iMac, that’s prob­a­bly not what you want, but OS X should re­mem­ber what you’ve man­u­ally cho­sen. Check the per­mis­sions for /Li­brary/ Pref­er­ences/Au­dio/com.ap­ple.au­dio. Sys­temSet­tings.plist by right-click­ing the file and choos­ing Get Info. The _core­au­diod ser­vice should have read and write per­mis­sions in the Shar­ing & Per­mis­sions sec­tion at the bot­tom. If it doesn’t, you can fix it by open­ing Ter­mi­nal and typing sudo chown 202:202 /Li­brary/Prefe rences/Au­dio/com.ap­ple.au­dio. Sys­temSet­tings.plist to set the cor­rect own­er­ship and then sudo chmod -N $_ to re­move any ac­cess con­trol list that is over­rid­ing th­ese per­mis­sions (the $_ re­peats the pre­vi­ous com­mand’s last pa­ram­e­ter). Also run Re­pair Per­mis­sions in Disk Util­ity in case what­ever messed up per­mis­sions for your au­dio setup af­fected other files as well.

If Yosemite for­gets sound pref­er­ences, check per­mis­sions on its au­dio sys­tem set­tings file.

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