My Samsung External 1tb 3.0 Hard drive is no longer showing up on my mac?

I've tried it on my friends mac and it shows up straight away. Any ideas?
It's a Samsung USB 3.0 1tb. All my other External Hard drives work fine. Just this one wont show up on my mac anymore.
Like i mentioned before it does show up on my friends macbook.
Thanks Dom

~~It's just strange that it reads fine on a different macbook.
Superficially its very strange, however Ive seen same countless times, minor power diff. between Macs on a dying SATA card.   Thats why its called "haunted (external) hard drive syndrome", .. 2 symptoms are illogical diagnostically
The 50 cent part inside most external HD is a nightmare.
If you had a new external enclosure, diagnosing same would take less than 2 mins.
SATA card as found inside a typical USB external hard drive

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