Sometimes when taking a pic on photobooth, then the screen dims.....reboot

sometimes when i take a picture on photo booth it counts to 3 and then right when its supposed to take the picture the screen dims and i can't do anything and i have to hold the power button to shut it off and then restart it.

First, I would suggesting resetting PRAM and NVRAM. (http://support.apple.com/kb/HT1379)
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
Now try taking the picture again and see if it cuts out.
If you still experience the shutdown, then it may be time to try resetting the System Management Controller (SMC) (http://support.apple.com/kb/HT1411?viewlocale=en_US)
If the computer is on, turn it off.
Disconnect the AC Adapter and remove the computer's battery.
Press and hold down the power button for 5 seconds and then release the button.
Reconnect the battery and AC Adapter.
Press the Power button to restart the computer.
Let us know if either of these help to resolve your situation.

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