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Why is there only a white screen on Mac start up?

Asked by tan253 (2948points) April 12th, 2013 from iPhone

My computer boots and then it’s just the white screen, after about 15 minutes a folde with a question mark appears but that’s it?
I’ve tried starting holding the shift key and P R option and command but nothing.
Any ideas?

It’s a MacBook Pro unsure of operating system.

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