Inspect the radio fuse in the vehicle's fuse box. If it is blown, replace it with a new fuse of the same amperage.
Check the radio connections. Make sure all the wiring harnesses and plugs are securely connected to the radio.
Check the speakers. Ensure the speakers are not blown. Connect a different audio device to the speakers and see if they work.
Check the antenna. Make sure the antenna is properly connected and not damaged.
Inspect the radio head unit. If all the connections are secure and the speakers and antenna are working properly, the issue could be with the radio head unit itself. You may need to have the radio repaired or replaced.