1999 Jeep Cherokee Vehicle will not start.

I stopped to get some gas on my way home from work yesterday. When I got back into my Jeep, I placed the key into the ignition and turned it. The dash lights and radio turned on, but it would not start. No clicking. Nothing. I took the key out, waited a second. And then tried again. This time none of the lights or the radio came on and it still wouldn't started. I checked the battery and it has a full charge. The headlights, break lights and dome light all still work. A friend of mine suggested that it may be the 'neutral safety switch' or possibly a blown ignition module. Would this cause all of the power to the dashboard to be cut out too? Thanks for your help!