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IF you have power to the unit then the circuit board at the bottom has failed or the touchpad has. There is no way to test either, so I would buy both and return the unneeded part to expedite the repair. Either part is easily replaced with basic hand tools. Repairclinic.com is one place that allows returns with no hassle. Let the vendor of your choice look up the parts as they can vary by the serial# ***** the unit.