Phone Does Not Connect

cannot connect to juno main computer. everytime i try I hear a click from the speaker, then the windo opens and says: try again / dont try again. I have tried all the usual...re-booted, disconnected phone lines and reconnected and still get the same sound and the same try/ dont try appears. The computer was working this morning. Went out,left computer on, returned three hours later, tried to connect to the web and that when I got the dont try and the sound of a click in the speaker...help