How do I get an external hard drive to mount?

I have two Maxtor One Touch 4 Plus External Hard Drives. One works the other doesn't. The one that works is over a year old and has been a trusty loyal aid. The one that doesn't is only a couple of weeks old. It worked fine initially. Now no icon appears and its volumes won't mount. I have switched both HD's between a MacBook Pro and an iMac with the same results. I've also switched between USB and Firewire cables. Same again.
I have a fair idea what went wrong.
The adapter for the new faulty HD was dislodged a little from the power socket. A small electrical crackle was heard, nothing to serious, but obviously enough to create this problem. The power jacks here in this part of the world are not often the best and snuggest of fits.
I have visited the Seagate/Maxtor "support" sites and come away with nothing other than switching on and off, etc... very elementary.
Any suggestions as to how I can get this dodgy piece of hardware to get over itself and get operational again?
Thanking you in advance.

Do you hear the drive spin up?
You may want to contact the manufacturer and ask for a replacement power adapter/cord and see if that helps.
Personally, I think there has been some damage to the circuitry inside the enclosure, which really can't be repaired.
~Lyssa

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