Supra won't start completly nothing is coming on

[MA70-3.0GT]

First thing I would suggest is to check all the fuses, relays & fusible links. There's some in the box next to the battery & depending on model (a few specs of your particular car wouldn't go amiss) either one or three on the actual positive lead of the battery. Also there's others behind the driver's kick panel.

Once you're certain all's well with fuses etc (and that everything under the bonnet's connected) then the next step if you still have no dash lights would probably be to check the ignition switch & it's wiring.

P.S. Oh, have you tried locking & then unlocking the car with the key before trying to start it? The factory immobiliser can require this to be done before allowing the car to start, also if that fails then try the same but using the passenger door lock as the switch can wear out on the driver's side.

Once you've gone through the electrics post back & let us know what you get.