Start up problems after 10.6.2 upgrade

After upgrading to 10.6.2 my computer restarted and hung up on a circle with a line through it. I restarted, the same. i reinstalled Snow Leopard and can now run normally. I ran Disk Utility and it said everything was fine.
I want to keep my iBook Pro running up to date software, but I want to solve this first. According to a document on the support website, the circle with a slash through it means, "could not load boot.efi, or some other issue" and I have no idea what that means or what to do about it.
Thoughts?

That's a little helpful. Thanks. I did use Disk Warrior a couple of years ago but stopped when it stopped launching, giving me some error code I couldn't decipher.
Now what do I need to do about? Will the problem reoccur if I try to upgrade again?

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    - mdimport -L or -A or -X return nothing (on my iMac they return the list of plugins, schema etc.)
    - rebooted many times also in safe mode - null
    - the problem exists also for the other user on the same MBP
    - tried OnyX as described above.
    No effect!!
    Now my question is: what can I try next ?
    I'm sure there is some parameter somewhere (some .plist ?) that can re-enable Spotlight. But which one and where ?
    Thanks in advance
    Piero

    Take a look at Spotless
    http://www.fixamac.net/software/spot2/index.php
    It deals mainly with Spotlight indexes, but it also contains some diagnostics - its description includes the following:
    Spotless will automatically find and delete the "mds-crash-state" file from selected volumes. The file may be created if the Metadata Server crashed or was unexpectedly closed during the indexing process. The presence of this file can prevent Spotlight from indexing the volume in the future.
    Spotless allows you to see exact size of the index directory on each volume.
    Spotless also includes an on/off switch for Spotlight.
    ------------------

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