My macbook pro retina wont recognize my external hard drive

my macbook pro retina wont recognize my external hard drive.
i opned the hard drive in the past on my computer and used it alot.
one time when i took it out i forgot to eject it, and since then when ever i conect it it would never show up on my computer or ever recognize the device.
please help me!

For starters try a PRAM reset.

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