2002 Jeep Grand Cherokee Limited Edition Starting Issues

This morning on they way to work I walked up to my Jeep only to find it was totally dead, no lights, nothing electrical was working. Replaced the battery with a new one same result, I was expecting the hood light to at least light up when I replaced the battery. Get inside insert key turn - nothing totally dead. Is there a reset switch or something that needs to be done when battery is replaced? This is my first Jeep, have enjoyed it very much and this is the first major problem I have had with it. Any ideas or web links would be useful.