When I turn my computer on,it asks me to log in, and when I do, it is a white screen. HELP!

When I turn my computer on,it asks me to log in, and when I do, it is a white screen. HELP!

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You may have a corrupt System File in your OS on on your HD. Try doing a repair (Command-R) boot running disk tools repair disk and repair permissions on your boot volume. If that fails do a reinstall of the OS.

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