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Helpful answers
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Mar 23, 2013 3:11 AM in response to suhailfromdehradunby Klaus1,Usually a SMU reset will do the trick. You do not say what version of OS X you are running or what type of Mac you have, so only some of the following will apply:
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:
http://support.apple.com/kb/ht1379
If you are using a Wireless Keyboard:
http://support.apple.com/kb/TS3273
Firmware updates for Intel Macs:
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