[InstallTech]

Re checking the ground is a good idea. If you're sure you're getting power and ignition, then check the ground. Did you check the fuses on the back of the radio? Sometimes, they may not look blown, but actually are. Disconnect the harness from the radio and check to see if you have power at the harness going into the back of the radio. If you have power at the car's harness, and not at the radio, then there's a break in the circuit. And yes...the orange wires don't go to anything. It's not neccessary to hook those up. Just keep those tied up seperately, along with the power antenna wire. If still none of that works, take the radio to an install shop and have it bench tested to make sure the radio is still in working order.