When trying to access debug, system reset, config, admin, or install I get "access denied" displayed. The Norstar system worked fine until a phone was knocked off the desk and I believe some of the keys were pressed by mistake. Now I cannot get a dial tone when selecting any line. If I select a line and then press "Intercom" I get a dial tone but, as soon as I try to dial a number I get a fast busy. Desperately need help from anyone.