Start up screen changes color from blue/gray to brown

My Macbook Pro recently started changing colors:  When 'start up' it begins with a blue/gray (normal) color but then changes to a light brown color.  The apple icon is still present though...
Any ideas as to why the screen changes its color?

You should try to erase the drive with Disk Utility, so any filesystem problem will be fixed, but if you haven't made a backup, you'll lose files.
1. Go to Utilities > Disk Utility.
2. Select Macintosh HD in the sidebar and go to Restore tab.
3. Connect your external disk and drag it from the sidebar to Destination box, and press Restore.
If it doesn't help, take the Mac to an Apple Store

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