White screen after Windows 7 on MacBook Pro

HI,
I bought MacBook Pro on Apr 2011 and I am trying to install Windows 7 by using boot camp, but after installation in first boot of Windows it stuck at white screen with some kind of beep sound and keep repeating the same at same point.
Can I get help in resolving this? I am new to Mac book and trying to resolve the issue from past one month.
I appreciae all your inputs in resolving the issue.
Thanks
Brahmaji

nevermind anyone... I've already found out how. Once i remembered that taking out the battery resets a couple of things I did just that and my brightness is now back to the way it used to be.

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If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
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Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
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White screen after Windows 7 on MacBook Pro

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