Start-up screen flashes purple

The grey/white boot screen flashes purple at start-up. While it is a bit disconcerting this development does not seem to adversely affect the OS.
Has anyone found a means to have the OS return to normal start-up functioning?
Thanks in advance.

Try Reset PRAM.
Some of the display settings are stored in PRAM.
Reset PRAM: http://support.apple.com/kb/PH14222
Best.

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Fixed. Thank you John.
I renamed the preferences file but that made no difference.
So I repaired the catalog (errors were found) and optimized it. When I started the Organizer, thumbnails were displayed (that's progress) but then the screen-flashing started again (whole screen, as usual, not just the Organizer window). Before I could close the Organizer, my system stopped with a blank, black screen, and no response to any input. I had to hold the power button to power down. On reboot, it blue-screened. On next reboot it started normally.
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Ricky Sherwood wrote:
.... - what should i do, ...
The Basic Troubleshooting Steps are:
Restart... Reset... Restore from Backup... Restore as New...
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http://support.apple.com/kb/ht1430
Backing up, Updating and Restoring
http://support.apple.com/kb/HT1414
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Start-up screen flashes purple

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