Immediately hold down the command + option + p + r keys.Instructions for dealing with the PRAM are here on Apple’s site ignore the title that refers to Mavericks since those instructions should work with all version of Mac OS X: If it cleared up with rebooting it might simply be an issue with your PRAM or NVRAM depending on the make/model of your MacBook Pro. That said, have you tried hooking up an external keyboard & mouse to the USB port on the machine to see what is happening? If an external keyboard and mouse work, but the built in keyboard & trackpad choke it could mean there is an underlying hardware issue. Please update your answer with the exact model number so we have more info to work off of. While you say you are using a MacBook Pro running Mac OS X 10.6.8, it’s unclear what model you are using.
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