Is your Driver Station app running?
In the Driver Station there are status lights that tell you what can be detected.
It's one of the tabs on the left, the second one down (Diagnostics).
Check those and tell us which ones are green:
- Enet Link - means an Ethernet cable is detected
- Robot Radio - means the Open Mesh radio is detected
- Robot - means the roboRIO is detected
How are you connecting the laptop to the roboRIO?