What year is your car? That sounds like the key may not be coded to the car-- anyone with VAG-Com can fix it if that is the problem.
Have you swapped the instrument cluster or ECU?
If you haven't changed anything on the car (instrument cluster, key, ecu) try a capacitive discharge (disconnect both battery leads and touch them together for 15 seconds).
Try it at your own risk though.
I bet this is mk4 content.
Super easy to delete immo... Just take your whole harness and ECU out, swap with a early passat harness and ECU. Done. Stand back, have a wine cooler... Because now you are awesome!
Vag-Com services 1990 through current model year. PM me with your needs.
Mild to Wild Motorcycle Work: www.facebook.com/Local603Chops