[jdl]

I'd start by checking applicable fuses for the starter circuit, if you haven't already? Not only check the fuses, check for voltage on the fuse circuits. Even if the fuse is good, if there is no voltage, the circuit is still dead. If you were using only a remote start button that connects to the starter solenoid and no starter action, take the starter off and have it tested. Some of the national brand autostores will test it for free. Also, check voltage and ground connections.