My laptop just fell of and start to making a loud sound

The hard disk might have had a head crash. according to my research it's easy to replace https://www.youtube.com/watch?v=6d579KN4...

This video might no be high quality, it should get you up and running. Finding a hard drive is easy. You can use any 2,5 inch Hard disk or even the newer SSD's. Unfortunately, if the hard disk is indeed dead (you can check if you just turn it off and back on, if it boots in windows or any os it is probably something else but if it doesn't the hard disk is dead) all data is lost. I hope this helps you out.