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Go to applications - preferences - touchscreen. Follow the instructions to calibrate your touchscreen. If it does not work, reset your phone by pressing the small button at the small hole at the back of the phone with a safety pin.
The microphone is located under the last set of keys . you can open it up and see if when u dropped it a connection came loose but my guess when u dropped it you damaged the mic itself therefore the only way to fix it would to be to get a new phone
The 650 seems to have a delicate headphone/mic jack. Dropping the phone, even gently, seems mess up that jack. I returned my first treo 650 as defective, and got a new one. The same thing happened to my new 650 after I simply compressed the phone in my breast coat pocket by holding my mail against my chest.
I can't get a new one because the replacement treo comes with no warranty of any kind. :(
My advice would be to find a PDA/phone repair service to repair the jack or diagnose the problem if it turns out not to be the jack.