I would suggest the following
1. Look for any physical damage on the screen. If there is any, proceed to step 3
2. If there is no damage, open the case, and try reseating the cable in the socket on the mainboard
3. If none of the above options work, buy another screen off eBay ("Treo 600 Screen Replacement"). You might want to go for the LCD and digitizer to give you a better chance of success.
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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.
You may have dust accumulation around the edges of your touchscreen, between the screen and the case.
Try using a can of compressed air. Gently press down on the edges of the touchscreen to expose the gap between the screen and the case, and shoot the air in there. This worked for me when my Treo 600 touchscreen stopped responding.