I have a MBP running Snow Leopard. The keyboard and trackpad became unresponsive, even though music was still streaming through Google Chrome. So I held down the power button to force shutdown. When something like this occurs, is there anything that should be done upon restarting the system again? Any general maintenance, system checks, etc? From my experience with Windows, not infrequently after similar scenarios, forced shutdown or crash, upon restart it'll automatically go into some type of disc scan. I wonder if anything similar occurs or is necessary with OSX. And lastly, when the system freezes like in my instance, if that's considered a freeze even though music was streaming all the while, is holding down the power button the only resolution? Are there no other safer alternatives to attempt first? Thank you for any help.