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how do you enter diagnostics on the 8300 HD box?
Diagnostic for the Explorer 4205HDC: 1. Turn TV on. 2. Turn off cable reciever. 3. Press select button until mail light flashes. 4. Press channel down button. 5. Diagnostic screen should appear. USB ports are for keyboard and mouse.
what about 8240 hdc box
For 8300HD box, with TV on and cable box off, press (red) HELP button and the screens come up (all 33 of them.) Press right/left arrow to scroll through them