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You need to reprogram the keypad. Press and release the learn button on the back of the motor. Within 20 seconds, press your four digit code into the keypad and press and hold the enter button until the lightbulb on the motor blinks once. You are finished.
If you are comfortable taking part of the phone apart there is something you can try. Remove the two Torx screws right below the battery. Gently pull the plastic cover loose. There will be a cable that connects this portion of the phone to the keypad/LCD/etc. Clean the connector on this cable and the connector it was plugged into with 99.5% Isopropyl alcohol. Reseat the cable and the part of the phone you removed and replace the screws you removed. If this does not work the keypad flex on the phone is probably damaged and will need to be looked at by a repair center.
This happened to mine after I got the Razor wet - I pulled the battery and the sim card, blew it out with a can of compressed air and it worked for about 8 months. Then it got hot out in my car and started doing the same thing - blowing it out hasnt worked again-
Saw quite a few of these.
Have you tried taking the battery and Sim out while the phone is still on?
did you try to flash your firmware on your Razr?
there is one firmware will mess up your keypad, but all you have to do is apply keypad flex and it will work again. A friend recently updated his firmware and had to re-apply flex, works fine now.