Wd my book 500gb studio edition wont turn on, white light half lit

Hi,
I have a Western Digital My Book 500GB Firewire/eSATA/USB 2 Studio Edition external hard drive that i bought 2-3 years ago. I've backed up a lot of data then and after that not used it at all until recently. I can't seem to get it to mount under Lion, as soon as I plug in the power lead the white bar of light at the front of the drive lights up but only the top half of it, there are no noises and plugging in a USB lead does not show the drive on my iMac.
Can anyone advise please, there's tons of data and I have only used the drive literally a few times. I just checked and my limited warranty expired six months ago so I can't ask WD to help.
Any help is greatly appreciated.
Thanks.

To give the conclusion in case anyone googles to here. I had to pry open the original WD enclosure and get the hard drive out. It's a big, cheap, plastic box made to resemble Apple's shade of silver, thus giving false confidence in quality of build which is atrocious.
The hard drive itself is perfectly fine, all the data is intact and transfer is at full speed. I had to get an external SATA to USB adapter and connect it to my iMac via a USB port. From there Lion treats it as any other external hdd.

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Message was edited by: WZZZ

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Wd my book 500gb studio edition wont turn on, white light half lit

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