Try disconnecting the power from the FireTV receiver, wait about five seconds or so, then plug it back in. The receiver should reboot and you should get your home screen on your TV. Now, if your remote refuses to work (pressing buttons does nothing), try this: make sure your remote is in line-of-sight to the receiver, open the remote's battery compartment, remove the batteries and put them back in. Now the receiver should detect the remote and the remote should start working.