MacBook turns on but then freezes at a blue screen
I accidently dropped a book on the bottom right hand corner of my MacBook. Since then it has had this problem, freezes at a blue screen when i turn my MacBook on. I would like to fix this problem by myself, but if its too hard i would at least like to back up all my data before sending it into the apple store to fix my MacBook. I was told i need to use an external hard casing etc etc. Does anyone know exactly how to do this? Also, i cant backup my data right now with an external harddrive because nothing pops up for me to back it up. Thanks in advance
Is this a good question?