The second most common problem is incorrect entry of the security access code. This is a large cumbersome code, do not try to type it. Cut and paste the code from the browser to the terminal or DOS window. For Windows users, right click on the bar at the top of the MS-DOS prompt window. Paste is under the Edit menu.
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Test your sound subsystem. Record a 30 second message and see if you can play it back. If this does not work, you are having problems with your audio drivers or sound card. If this works, open a second sound recorder. Record in one while playing back in the other.