Lost sound after updating to Mac OS 10.4.9

Hello everybody
I just updated from 10.4.8 to 10.4.9 and after rebooting, when I opened iTunes to listen to some music I realized there was no sound. I then checked in the Sound panel in the system preferences and the control panel does not recognize any device.
Any suggestions on how to solve this?
Thanks in advance.

That's right, I updated using the automatic software update... I thought doing so was safe, so I'm a bit dissapointed, this kind of thing should not happen...
I'm downloading the combo... Hope it helps.
Will notify if the problem is solved.
Thanks again.

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