Everything seems to be working, but in s l o w motion. Opening aps, opening internet, opening new windows -- all like the first dial-up modems. Lots of spinning blue balls.
Tried on my iMac to update again with the Apple combo updater. It seemed to be loading, except when I came back I don't think it ever restarted, and the system info doesn't say anything different. No noticable change in behavior.
Any ideas?

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