The most likely cause of this problem is either that the screen is damaged or one of the wires got broken when you dropped the camera. You need to determine what the actual cause of the rattling noise is. I would first start by viewing the [guide|63075|Teardown for Wire Fixing Guide].
If you find that you need more information about anything else, then the [[Pyrus PY21S03211 Troubleshooting|Troubleshooting Guide]] should able to help you further.