If a desktop try to mount the unit internal....test.
I have a VAIO 40GB hard drive which I use for storage, it has been working fine until today, now it's not showing an icon in My Computer so cannot access, have tried it in another pc but still have same problem! I then happen to be using Skype while it was plugged in and the web cam had an error saying there is another web cam in use! I then unplugged the hard drive and it cured the web cam so it seems for some reason the hard drive thinks it's a web cam! Can somebody please help?