Blazer wont start!!

[BLUE THUNDER]

Well, just like the title, my Blazer wont start. I pulled the starter and had it checked and it's fine. I re-installed and cleaned all the terminals. When I turn the key I hear a "bonking" noise under the dash. It kind of sounds like hitting an empty pot with a wooden spoon, if that makes sense. The noise comes from the passenger side from a rectangular box under the glove box area. Could it be a bad ignition switch? Has anyone out there experienced the same thing. Any help would be appreciated. Thanks!