Computer freezes during startup

My Mac book pro. Freezes during startup.  Spinning wheel goes for about 15 seconds, then just stops.  Any ideas?

Ok, I tried that and it didn't help, but thanks for the suggestion anyway because device drivers are always a pain in this.
Then I started looking for log file changes because I suspected that something (related) ought to be logged about this nagging bug. The witch hunt directed me towards the google updater agent -- whatever -- that got stuck on bringing chrome to the latest level.
I read all sort of incompatibilities between google chrome and macbooks, this could be another one. I downloaded the latest version of chrome manually, overwrote the existing implementation of chrome and the freeze-up seemed to vanish.
Not so nice this all.

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    Message was edited by: Barry Hemphill

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