External HD not mounted on desktop but available in File Open

I have an Intel MacMini which I have recently upgraded to Snow Leopard. The internal hard drive is about 80% full so I have bought a WD My Book Studio II 1TB external drive which I currently have attached by USB (as I saw some people were having issues with FW connections).
I use SONOS music players and have my iTunes library on this external HD. It seemed to work fine for the first few days but now the SONOS cannot find the music library. When I login to the Mac I do not see the WD drive mounted on the desktop but it appears with a green light in the WD drive manager and I can also see it as a mounted drive if I click in File>Open in an application such as Text Edit. My applications such as iTunes and iPhoto canont see the data stored on this drive  but within TextEdit I can open folders so the drive must be attached and working to some degree :-/
Does anyone have any idea why it would be behaving like this and what I can do to rectify this?
Thanks
Amanda

Try verify/repair the hard drive with disk utility.  http://support.apple.com/kb/HT1782

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