I cannot get any sound from my imac

Hi
I cannot get any sound from my imac either itunes or alert sounds I've checked that everything is turned up and not muted
thanks in advance

If a simple reboot doesn't fix it, try resetting the SMU.
Depending on which iMac you have, one of these links will explain how.
Resetting the SMU on a G5 iMac:
http://support.apple.com/kb/HT1767
and on a Power Mac G5 :
http://support.apple.com/kb/HT1436
Resetting the SMC (System Management Controller) on Intel-based Macs:
http://support.apple.com/kb/ht3964
Resetting your Mac's PRAM and NVRAM:
http://support.apple.com/kb/ht1379

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