Cb750 not getting power from battery to ignition?

i have a 1982 cb750c that i recently got in a trade, i put a charged battery in the bike and turned the key to on and nothing happened, no lights nothing. but when i use a screwdriver to crossover the selonoid that is between the battery and the starter, the engine will crank, but since it has no ignition it does not start. so my question is what could be wrong?