Not Starting on 2000 Audi A4 Quattro

I have an Audi A4 1.8t Quattro that's not starting. Changed the battery same thing. All the electronics work (radio, windows, etc). What's could possibly be wrong

Asked by for the 2000 Audi A4 Quattro
3 answers
Sounds like the starter or starter solenoid would be the next place to check.
timing belt maybe
timing belt?