Re: Operating System not found
Only a few "hardened" laptops can actually survive being dropped -- and you would know if you had one of those.
The laptop continued to work briefly because it was running from code cached in system memory. But, when you went to use the hard drive, the laptop failed.
It's also very likely that you suffered a "head crash" on the hard drive when you dropped the laptop. If that happened, the likelyhood is that nothing is going to be recoverable -- at least, not using any methods available to you.
Professional recovery services actually disassemble the hard drive, repair the hardware, and reassemble it -- all in "clean room" environments. Which is one reason they charge THOUSANDS of dollars to recover a drive.
The "shop" is NOT going to be able to fix your drive -- if it suffered a head crash -- no matter what they tell you.
So basically, you most likely need a new drive.
Ubuntu 15.04 Mate, Mint 17.1; MS Win 8.1, Win10 TP.
Will not respond to PM requests for support -- use the forums.