WD External hard drive not shown up on My Computer and Hang up During Boot

WD External Drives External Drives for PC
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I purchased WD My book 2 TB two months back and since It was working fine on my Windows XP Desktop,

But Yesterday I connected it with my new Dell inspiron laptop having windows 8. At first it get recognized but after 2-3 minutes it lost connection…………L  and after that It is not recognized  neither by Laptop nor by desktop…………only blinks light…L…………Please help……….