The grey and blinking screen by startup

As the title said, my Macbook pro starts up with the grey and blinking screen instead of the original apple Logo, but then all still normal for using.
The laptop bought for ca 1 year and no other tech problems found.
Does anyone know how to fix it?  Thx.

>SystemPreferences>Startup Disk   make sure your bootdrive is selected.
http://support.apple.com/kb/TS2570

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