Download/ Install any/all Updates for your system.This link will take you to your Support Webpage.
http://www-307.ibm.com/pc/support/site.wss/product.do?brandind=10&familyind=338517&machineind=0&modelind=0&operatingsystemind=49979&template=%2Fproductselection%2Flandingpages%2FdownloadsDriversLandingPage.vm&validate=true
This model has a history of touchpad problems. Most times it is the ribbon cable that has come disconnected from the board. The connector is beneath the "C Cover" or top coer assembly. This is not for at the faint hearted. LOL. If you can keep track of screws and sizes. The manual may be helpful. Most IBM/Think models have full videos on how to repair replace something on the thinkpads. This model does not have one that I could find. But here is the manual
http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/42t7841_01.pdf
page 64
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