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Helpful answers
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Oct 10, 2012 8:40 AM in response to SteenaReneeby Klaus1,This generally fixes it:
Resetting the SMU on a G5 iMac:
http://support.apple.com/kb/HT1767
and on resetting the PMU on a Power Mac G5, G4 and G3 :
http://support.apple.com/kb/HT1939?viewlocale=en_US
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Oct 10, 2012 8:53 AM in response to SteenaReneeby Allan Jones,Did this happen after you used headphones or a set of external speakers that required you to use the audio-out jack on the PowerBook?
If so, see this thread:
https://discussions.apple.com/message/19930032?ac_cid=sa123456#19930032
It's about a different Mac model but the PowerBook shares the same audio port technology so the suggested fixes and my bit about the cause and future prevention apply to your computer as well.