MacBook Pro screen turns blank white when try to turn on!

My MacBook Pro is turning on to startup screen with apple icon and loading signal, but then after a few minutes the screen just turns white. What is wrong?

Reset the PRAM >    Resetting the PRAM
If that doesn't help, if your Mac is running v10.7 Lion, v10.8  Mountain Lion, or v10.9 Mavericks, startup your Mac while holding down the Command + R keys. From there you should be able to repair the startup disk if necessary and restore OS X using OS X Recovery
For OS X prior to v10.7, insert your install disc then startup your Mac while holding down the C key. From there you can use Disk Utility to repair the disk.

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