MacBook Pro will not boot from Apple Logo Screen - No HD recognised

Hi all,
I encountered a problem booting my mid 2010 MacBook Pro yesterday. I currently run OSX Mavericks.
The computer has been great for the last 4 years and has never encountered any major issues. Yesterday I dropped it on carpet while sitting on the couch (it was a VERY small impact) and I continued to use it for a few hours. I did a safari update that night also. I then closed the lid which would have put it to sleep. My flatmate asked for a file later that night, I took his USB and stuck it in my computer, THEN opened the lid. The computer never booted up (It was stuck on the apple logo with the spinning thing underneath it). After doing this for a minute or so the computer would turn off. After multiple attempts the same thing happened.
I read many posts on this - I am assuming that the problem occured because I brought it out from sleep with a USB in the side. I have taken the following steps to attempt fixing the problem -
*safe boot - no luck
*reset PRAM - no luck
*recovery mode boot - getting disk errors.
In recovery mode boot I cannot reinstall a new OSX version because there is no internal HD disk mounted. It only gives me the option to install OSX to the Recovery HD, which is locked.
Using Time Machine backup wont work as there is also no Internal HD detected to load to.
In Disk Utility it no longer has 'Macintosh HD' - It is further labelled 'disk0s2'. I cannot verify, repair OR erase this disk.
Can someone PLEASE assist with what I might be able to do. I need to somehow mount/unmount/detect my internal HD. I am happy to detect it and format it as I have Time Machine backups on an external HD.
I am no mac genius although I do learn quickly. If I can get assistance It would be very appreciated. I have a feeling I can sort some issues out using Terminal although I need command assitance?!?
Apologies for the long post although I want to outline everything I have done to attempt to isolate the problem.
Thank you all in advance.

Does your flatmate have a Mac as well?
If so, you could always get a 8GB+ USB stick, download Mavericks using your Apple ID and use DiskMaker X to create a bootable installation disk on the USB stick. Then boot using the USB stick (hold down the option ey whilst booting to select it) and try to reformat your drive using Disk Utility and, if you're able, reinstall OS X on your machine and then restore from backup.
The only hitch may be that your hard drive is dead and that you need to install a new drive. You'll know once you boot from the USB stick, though, if you can format the drive or not.
Good luck,
Clinton

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