I would have to assume when you said you replaced the starter solenoid, that's the relay on the firewall and not on the starter. I would start at the battery, check the connections, and go from there. And when I say check, I mean take them off, clean, and reconnect. Also, if you did replace the relay, make sure you hooked it up right. I changed mine once and put the small wire on the lower stud instead of the upper and got nothing. Took me a while to figure I had it in the wrong spot.
Can you still start it jumping the relay? If your not getting a clicking sound when you turn the key, then it's probably still an ignition switch issue. If the relay clicks, then it's that.