If you can't turn on the Synaptics Pointing Device, I recommend you update its drivers. Just access the official web page, select your operating system and click the download link. Save the file to your PC, press Windows + Pause/Break key combination and open Device Manager. Expand the Mice and other pointing devices list, right-click on the Synaptics device and select Update Driver Software. Use the Browse option to navigate to the downloaded package, select the driver and install it following the on-screen instructions. If you have issues, check the FAQ and Troubleshooting page provided by the developers.