Hi,
Really hoping for some help

I have recently upgraded my laptop, ensured all my files and pictures from last 10 years including Sons first 2 years were backed up onto a hard drive. One night I came home last week and my harddrive was on the floor and it would appear my son took it out of a drawer and had been playing with it. I have no way of telling if it had been dropped, the power lead was plugged in (From Iomenga Caddy) but not plugged into the mains.
So i dont know what happened to the drive but now it does not work, the light on the caddy comes on and there is a beep noise every 3 or so seconds. A freind of mine has taken the drive out of the caddy and put it into his tower, sadly the same issue happens, does not spin up and is not recognised by the computer, it states 0GB in the bios.
Is there any hope. i am hoping that it is an issue with the PCB and not the drive itself... does this sound feasible to you all and if so what is the next step. I have done a far amount of reading about this and can buy a new PCB board but then it talks about soldering a chip from old board to a new one... now that is when I get scared but I dont have the money to get pros look at this as quote I got yesterday was £400 to have a look... Can anyone help as it has irreplacable memories on that drive... Many thanks...
Many thanks in advance!