Macbook start up screen frozen

Sometimes when I turn on my computer, the start up screen comes on and then I can't do anything. I cannot move the pointer on my trackpad on my macbook. It's just a frozen screen.
Why? What can I do?

After you finally get it to reboot, look in the Console logs. They should give all the information you need to at least understand why it froze. I say "should" because the freeze may prevent logging.
Immediately after a freeze and a normal restart, search the logs for the latest entries.
You may also try starting in the Safe mode once to see if that helps.
Mac OS X: Starting up in Safe Mode
Summary
Learn how to start up in Safe Mode.
Mac OS X 10.2, Mac OS X 10.3, Mac OS X 10.4, Mac OS X 10.5, 10.6, Lion
To start up into Safe Mode (to Safe Boot), do this:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
During startup in Mac OS X v10.4 through Mac OS X v10.6.8, you will see "Safe Boot" on the login window, which appears even if you normally log in automatically. During startup in Mac OS X v10.2 through v10.3.9, you will see "Safe Boot" on the Mac OS X startup screen.
To leave Safe Mode, restart the computer normally, without holding any keys during startup.

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    Reset the PRAM
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