My Macbook keyboard and trackpad become unresponsive for periods of time when I shut my mac off or when I close the lid.

Sometimes it starts working again when I turn it back on and sometimes it doesn't. It's not the keyboard. I installed a new one and still have the same issues. I am not sure what to do to fix this problem. Has anyone experience this before? Any help would be much appreciated.

OK. That makes much more sense.
I would like you to create a new admin user with Users & Groups for testing purposes. Turn off auto-login if you have it enabled. Restart the computer and log into the new account. Test if the problem still exists or has ceased. If it has ceased then the issue is most likely something in your user account. You can start by using software like CockTail, Onyx, or Mountain Lion Cache Cleaner (look for them at www.macupdate.com) to clean up system, user, and font caches, check for old log files, etc. Do this all in your usual account, btw.
See how that helps your situation. If it's not in your user account, then it's a system issue. You can then try reinstalling to see if that helps:
Reinstall OS X without erasing the drive
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.

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  • My Macbook Air wouldn't go to sleep when I close the lid. I have tried to reset the SMC, but it didn't solve the problem.

    Normaly it goes to sleep, when I close the Lid, but suddently this function stopped. That means that Mac'en still is running and become warm, during transport.
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    Connect the power cord and hit the space bar on the keyboard.
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  • My macbook pro won't go to sleep when I close the lid

    I've been having this problem for a couple of years now, and it's getting pretty annoying.
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    I had the same issue.
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  • MacBook Pro shuts down when i close the lid

    Hey,
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    If it's unable to go into the proper sleep state for some reason then it will do that.
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  • How can I make my macbook pro go to sleep when I close the lid? Currently it doesn't sleep when on battery.

    How do I make my macbook pro go to sleep when I close the lid?

    For this and other power related issues the best first step to try is resetting the System Management Controller.
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