HT201541: Update the software on your Mac
Learn about Update the software on your Mac
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Helpful answers
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Feb 18, 2013 1:28 AM in response to BrianPHby Klaus1,A SMU rset can usually fix that.
Resetting the SMU on a PPC Mac:
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