Does anyone know why or what is the reason when starting a new iMac with Lion a gray bar sometimes appears when loading software?

Does anyone know why or what is the reason when starting a new iMac with Lion, sometimes a gray bar appears under the Apple that begins to shade to dark as it loads OS?  It does this on occasion.  One time the system loaded was VERY slow and terrible colors.  Pulled the plug, re-started the computer and it did not do this.  As I say, its only on occasion, not every time.  I noticed in the discussion page there were problems listed for 10.6 nothing for Lion.
Please advise, if possible.

You should see this 4 option menu.  Click on Disk Utility:
In Disk Utility, Select FIRST AID and then VERIFY and then REPAIR the disk.
Ciao.

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