Cheap and easy thing to try that may help and definately won't hurt. Replace all fuses. They can go bad from corrosion without being blown or necessarily even looking that corroded.

I'm guessing you had the key out or not in the run position when you jumped the starter. This would have kept vacuum going to the fuel shutoff and prevented the engine from starting.

If you have a multimeter and the wiring diagrams for your car, start tracing wires and see where you go from battery voltage to no voltage. If you don't have a multimeter and wiring diagrams, get them. You should be able to get both for under $30 at any decent parts store.

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.