10.6.7 Update No sound   5 mins to boot!

Updated from 10.6.6 to 10.6.7 last week and lost sound.
There's now no input or output options in the sound control panel and the Mute checkbox is greyed out but 'Mute' in checked. 
It's as if the OS sees no sound drivers or no sound hardware now
Can anyone shed any light on this?
In addition my machine now takes a good 5 mins to boot, seems to run fine once it's underway  - apart from no sound.
This initial boot up screen looks OK, but then it sits on a blue screen for 5 mins - then boots
Mac Tower
2 x 2.66 Ghx Duel Core Intel Xeon
8GB RAM

Firstly to try to cure the slow startup go to System Preferences>Startup Disk. Click on 'Macintosh OS X, 10.6.7 on Macintosh HD' and restart. Hopefully it'll start up at normal speed.
To try and fix the sound issue you could try downloading the combo updater (if you haven't already): Mac OS X v10.6.7 Update Combo
and reapply the update.
Often re-applying the update using the combo fixes unexplained problems.
If this helps you may need to repeat step one again as it seems that sometimes the Mac seems to struggle to find a startup disk, often after new installs/updates.
Before and after doing the update I'd also suggest repairing disk permissions: Utilities>Disk Utility, select Macintosh HD, click 'repair permissions'.

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