I can´t read my external Hard Drive Anymore

Hi, I just got a new Imac, the slim 27 in. one, I connected an external Hard disk to it and everything fine for the first two / three days. Now It won´t even recognise it, the light on the HD is on but there´s no sign that the computer is reading it. I actually have the same problem with my Mac Book Pro, at first it read my Hard Drive and now it doesn´t recognise it. i did the Hard disk utility and I got nothing.
Please Help!

You can try to do a Intel iMac SMC and PRAM resets several times, if that doesn't work then try another cable. If the new cable doesn't work your EHD may have failed.

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I can´t read my external Hard Drive Anymore

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