Grey Screen Freeze after 10.6.7 update

I have 2 iMacs. My wife's is 2008 3.06 Ghz 24" model with Snow Leopard. Just updated to 10.6.7, and on re-boot we entered perpetual grey screen freeze ups. Followed guidance from support article - specifically to remove peripherals (attached were 2 USB devices - HP inkjet printer and WD 500G portable HD used as Time Machine. Also connected to LAN via RJ-45) After re-boot I changed network to airport to access LAN. When I re-inserted ethernet jack the grey screen immediately came up. Tried various combinations and ethernet connect always kills machine. Any ideas? I'm holding off on 10.6.7 update for other iMac.

Because I've had strange problems with past system update downloads, I now always get my system updates from http://support.apple.com/downloads/
I always use the Update Combo version. It installs a fresh set of all previous updates as well as the new one. This gives you a fresh beginning with system 10.6.x. Since I adopted that practice, I've had no more issues with updates.

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