Hi, I just registered on here after browsing as a guest, I just had a problem on my o6 GTi, it displayed the same symptoms, it was the can gateway, when I opened it up it was green inside, got a second hand one from a mate of mine who is a VW breaker, it came from a late S3, plugged it in and the car started straight up and has been fine ever since, it's an easy job and gateways are cheap, it would need coding to work correctly with your vehicle options but the car will start without the coding if this is your fault.