My Dell D820's touchpad is not working correctly. I can move the cursor, but it won't click on anything. There doesn't seem to be anything preventing the buttons from moving (dirt under buttons). An external mouse works fine. Adjusted the control panel settings. Updated the drivers. Did a virus scan. Tech support came up with nothing. Any ideas? daily motivation the power of your subconscious mind overcome shyness stress reduction how to stop procrastinating parenting tips improve concentration