If your touchscreen stopped working and it’s been hard to troubleshoot the exact cause, there is a workaround. A product called “AirBar” (by Neonode) can turn any laptop into a touchscreen device. AirBar is a small plug-and-touch bar that attaches magnetically to the bottom of your machine's display. It emits invisible beams of light that can track your finger movements across the screen and input your gestures into the computer.
AirBars are sold at Walmart and Best Buy, among other retailers.