OS 10.4.11 and Audio Problem

I've just installed the update on my intel imac and now I have no audio - no audio in or out recognised in the preferences. The system profile still says that the inbuilt speakers/mic exist but preferences can't see them and the volume is greyed out.
Also, if I access the volume in the menu bar it just vanishes.
Has anyone else had this problem?

I too have been having problems. And they are getting worse.
Near as I can tell, the computer is messing with the internal/external speakers "switch". The 2.5mm jack port glows red intermittently, corresponding with the sound/no sound jumping. Since I have not touched my port in a few days, this is clearly not a physical switch problem.
Let's hope someone finds a fix, fast. I do not like having to spend scads of money on a new computer only to have it break faster than a PC in less than 15 months.

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