No audio since system upgrade

I have no audio out since doing the system upgrade.
Can anyone help?
I've tried taking the battery out and putting it back in.
Alex

Hi Alex,
A little more info on your Mac might help.Please go to "My Settings" on this page at the upper right ➦
On your  menu choose "About this Mac" and fill in : Version, Model, Processor and Memory.
Since you did say battery I'll assume a laptop. Have you tried a PRAM reset or SMC reset?
http://support.apple.com/kb/HT1431?viewlocale=en_US
-mj

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No audio since system upgrade

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