White Startup screen doesn't show always

This might seem trivial, but when I load my new Macbook Pro (500gb 15" new model), the white screen that shows it's on and loading doesn't always appear (loads maybe 1/4 of the time). Sometimes a light flashes on the top but generally it's completely black until the desktop loads. it will show up about 1/4 of the time. I always shut down from the Apple logo at the top. It's not a big deal, but I'm worried it's a sign of problems to come. Thanks!

I'm guessing you did not carefully read your owners manual, did you? Unless you are not going to be using your computer for several days at a time there is no reason to shut it down. Your manual states:
_Putting Your MacBook Pro to Sleep_
*If you’ll be away from your MacBook Pro for only a short time, put it to sleep. When the computer is in sleep, you can quickly wake it and bypass the startup process.*
AND
_Shutting Down Your MacBook Pro_
*If you aren’t going to use your MacBook Pro for a couple of days or longer, it’s best to shut it down.*

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