My External HDD is not recognized on OSX 10.7.5

Hi There,
I have a Western Digital My Passport external HDD 1TB.
I have been using it on both Mac OS X and Windows, as that's how I formatted it originally.
Today, my Macbook running 10.7.5 is not recognising the external drive.
When I plug the drive in I can see the power light coming on, so there is power going to it.
It is also working ok on a Windows machine.
I have tried it on different USB ports on my Macbook but it is not working.
I have searched online for updates, and tried to reboot a number of times.
When I last used the HDD on my Macbook I accidentally unplugged it without ejecting it.
When I ejected it Quicktime Player was open & playing a file from the HDD.
I assume this I was has caused the issue.
Anyone got any advice on how I can fix this problem?
Thanks in advance.

i can see it in disk utility but i am not able to mount it.

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iBook G4 Mac OS X (10.4.3) 512 MB Ram, CD-RW Combo Drive, 40 Gig HD, bought in October of 2005...
Message was edited by: Hilary_Rose

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Attachments:
USB-NotRecognized.jpg ‏28 KB

My External HDD is not recognized on OSX 10.7.5

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