Screen with blue background while boot for nearly 1 second

Display flatters for up to one second while doing the regular boot.
Means it gets blue with Apple logo bright - like a negative of original screen.
Was not observed with Mavericks first releases .1, .2.
iMac Late 2013, 27 inch, NVIDIA GeForce GT 755M 1024 MB.
Again possibly a problem with SMC and it's reset as first solution candidate,
or rather graphics?

You can rule out any hardware issues by running the AHT  >  OS X Mavericks: Use Apple Diagnostics or Apple Hardware Test
And check the health of the hard drive just in case.
Launch Disk Utility located in HD > Applications > Utillities
Select the startup disk on the left then select the First Aid tab.
Click:  Verify Disk  (not Verify Disk Permissions)
If DU reports errors, restart your Mac while holding down the Command + R keys. From there you should be able to access the built in utilities in OS X Recovery to repair the disk and restore OS X.
You can restore from a Time Machine backup using OS X Recovery if necessary.

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