|i had similar symptoms recently:|
after plugging in the cable the little green LED on the seagate drive started to light. good. but windows wouldn't detect anything.
it turned out that it was a cabling problem, indeed:
after firmly pushing the mini connector into the seagate case windows suddenly detected the drive and everything was working fine.
so the green LED just indicates: OK, i'm now getting power over the USB cable.
but it does not necessarily mean that an active data connection between the drive and the computer has been established.
i just don't understand why it's required to plug the cable in that firmly.
you may also want to check the socket / usb port at the seagate case: it's a portable - some dust may have accumulated in there preventing a proper data connection.