UPDATE : Sorry i know its a bit late but i thought i'd still go ahead and update the info for the sake of others who are facing similar issues cos when i had this issue i never found a proper answer.
So what we found out was that since my G27's other functions were all running and the shift indicator lights are also on everything was alright with the USB connectivity part of it. The only part that takes power from the external power supply unit is the steering wheel and the two force feedback motors thats linked to it since it requires a lot more power than what the USB can provide. So my issue was narrowed down to an external power supply issue.
So i took it to the service center and they said the power adaptor had to be replaced and that my actual wheel doesnt have an issue. But since they didnt have any spare power adaptors they could give me, they replaced it completely. What more could you ask for! From then on i lived a happy life.
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