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Helpful answers
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Sep 23, 2012 4:50 AM in response to billyblackby Klaus1,This can happen occasionally. Usually a SMC reset and a restart cures it. Not sure what particular iMac you have, so:
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
http://support.apple.com/kb/HT1436
Resetting the SMC (System Management Controller) on Intel-based Macs:
http://support.apple.com/kb/ht3964 and
http://support.apple.com/kb/HT1237?viewlocale=en_US
Resetting your Mac's PRAM and NVRAM:
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Sep 23, 2012 9:02 AM in response to Klaus1by billyblack,Nope tried it all. Nothing worked.
Mid 2011 Imac.
2.5 GHz Intel Core i5
Any other suggestions?
Billy
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Sep 23, 2012 9:23 AM in response to billyblackby Klaus1,Then you not running Tiger 10.4.11. What version of OS X do you have?