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May 23, 2012 10:03 AM in response to EthanFromStudentby Klaus1,Your audio settings may have been changed.
Open Audio MIDI Setup (/Applications/Utilities/), then check the Audio Output setting.
Change the Audio Output setting to 44100.0 Hz.
Quit Audio MIDI Setup.
More info here on no sound from built-in speakers:
http://support.apple.com/kb/TS1574?viewlocale=en_US
A SMU reset often cures the problem. Try this:
Resetting the SMU on a G5 iMac:
http://support.apple.com/kb/HT1767
This is the PPC iMac forum, but just in case you actually have an Intel iMac:
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: