HT1199 my computer displays grey screen and apple logo for 10 minutes or more during start up and shut down. sometimes it refuses to shut down . this issues started after installing OS lion. what do i do?

my computer displays grey screen and apple logo for 10 minutes or more during start up and shut down. sometimes it refuses to shut down . this issues started after installing OS lion. what do i do?

I don't think it's exactly an incomplete installation brody, but most likely in-correct permissions somewhere along the line that either happened, or became magnified during the upgrade. Also, it could be corruption as well.
First thing to do, is boot up holding down Shift key to do a safe-boot so we an clean up any corrupted OS caches, after that do another reboot, but go to the Lion recovery, and scan the HD for errors, repair any if you find them, and then try to do a Repair Permissions job.
That should fix the issue, if not, we can start doing a PRAM reset  and SMC for good measure.

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    <Edited by Host>

    What other solutions have you tried?
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    Maybe this might help.
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    Step 1
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    Mac troubleshooting FAQ: start-up woes
    How To Fix Common Mac Startup Problems
    Mac Stalls on Gray Screen at Startup - Troubleshooting Mac Startup ...

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