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

Today when i connected my western digital passport essential (500gb) to my desktop it does not shown up on my computer and when i restarted my desktop it hanged up in ‘windows is starting’ section. When i try to open device manager it does not open and as i disconnected my hd hardrive device manager opens, it even not chkds in command prompt when the hard drive is connected.So someone please give me a solution for it i have so much important files in it …pls reply…My operating system is xp

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My passport stopped working. Light is on, fell it running, but computer does not recognise it. Any Suggestions?

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……….