It should show something on the monitor like other pis.
Can’t explain why it wouldn’t be doing that and in that regard could only say:
- use a fresh image
- or try if you have your hdmi cabling correct
Anyhow, here is the (different) default password for the piaware sd card:
https://flightaware.com/adsb/piaware/build/optional#wifi
If you have no clue but want to try SSH, check this thread:
For Beginners - How-to SSH to RPi - Setup Putty in Windows