Hard Drive not showing up

Hi all. I've got a macbook pro 13-inch unibody that has a boot up problem. It was fine until a couple nights ago when the laptop slipped off my wife's lap and onto my arm. it wasn't a big fall but i got shocked by the heat so i accidentally hit the laptop and so began my problems. immediately after, the movie we were watching froze up constantly and so i restarted only to find the folder question mark. i booted up in target disk mode and tried to repair the disk using my other mac. disk utility couldn't fix it so i though maybe it was time for a HDD upgrade. the next day when i tried to salvage the files, the drive couldn't be seen anymore by either the boot cd or my other mac. so i replaced the hard drive and now, it doesn't detect the internal drive i put in at all. i took the new drive to a local shop to get it formatted and partitioned guid for os installation but when it was put back into the laptop, still no go. in between the original drive failing but still read by the laptop to not reading any hard drive at all, what could have transpired? i'm a bit lost as to what could've happened and whether i need to replace the HDD cable or (god forbid) the logic board. any help at all will be much appreciated. thanks!

@cmcsk they offered to format the disk for free in case my laptop was just not reading it due to it being unformatted. so the new drive was fine and it was successfully formatted. anything beyond that will incur a charge. since i feel capable of replacing parts i just was hoping to find out if this is just a boot issue getting the laptop to recognize the drive, if there are any startup sequences i can do to reset the brain of the laptop or is this sounding like a parts/hardware issue. i guess i'm hoping it's a reset thing because i haven't done anything from the time the laptop could still see the old drive (tried to repair it and no go) to not seeing any drive at all.
can the logic board confuse itself to the point of destruction? :-)

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Hard Drive not showing up

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