External Hard Drive No longer Appearing on Macbook Pro

Hello, I have a Iomega ldhd-up 1TB external hard drive which I have owned for about 3-4 years. The enclosure case of the hard drive is very poorly designed and the port for the USB cable does not fit the cable tightly. Over the years I often would have to turn off the hard drive and adjust the cord so it would appear on my computer. (yes i know its a bad idea to turn it off without unmounting, but i didn't have much choice)
However, as of today, it is no longer appearing at all no matter what I do. (not on the desktop, or disk utility, or anywhere). It is making the same sounds and the light on the external is showing up as if should be working though.
Does anyone have a fix for this or suggestions to make my hard drive appear and function again. Any help would be much appreciated! Thank you.

Since you have had a history of connection problems with the Iomega, get a new enclosure for the HDD.  That of course assumes that the HDD is functional.
Ciao.

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