External hard drive not picked up

Hi there,
I have a Macbook Air 2012, I have been using a ADATA Nobility external HD with it from the start. Now out of the blue my mac does not want to detect it.
I have looked for it under disk utility etc etc. but still can't find it. I have returned the HD to ADATA and they reported back to me that there was a software issue that they solved, and it has passed all their tests. Now that I just got it back, the mac still does not pick it up. I have tried my other external HD and that works fine on the mac and windows.
Please help.

You can call ADATA back and ask their help in setting the external HD up.
If they cannot help, you should return it promptly.
Best.

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