What's wrong with my hard drive?!

click is the reading arms trying to read the data. I would, just for safety sake, back everything up IMMEDIATELY. So that should your drive die atleast you have the backup. What could have happened was when the case slid off the edge of your desk it may have jostled the read/write heads a bit to where they were a bit off track. The reboot noise would have been those having a problem getting the proper calibrated site (arms in different spot then logic board thinks they are) hence the long boot time. Since it rebooted just as quickly it was probably that and the heads were able to realign properly. Just my 2c.
 
is the noise coming from the drive ? Y or N
have you tried running bootup diagnostics from on the drive/ Y or N
 
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