It sounds like you may need to remove the roller to clean right up to it. You can remove the 2 screws on either side of the roller housing and then remove the cap. This will allow you to access the dirt.
When your phone is ringing use the volume to turn it down. There should also be a setting on the CarPlay to turn it down without your phone needing to...
It is not likely that your laptop is not turning on because of the screen. It is suggested that you take your laptop to the nearby repair center and explain...