Motorola surfboard sb6121 receiving, but not sending.

Motorola surf-board sb6121 receiving connection, but not sending. I have comcast, just internet. While setting it up, I found The previous tenants were using a entry series evo1-5-u/u amp, but it doesn't have a power box now, so I took the main line form the input and plugged it into the modem. This caused the modem to show a green light for receiving data, but the one beneath it, for sending, blinks blue. What could it be?
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More about motorola surfboard sb6121 receiving sending
  1. Call Comcast, you have to provision your modem so that it works - Comcast will record your modem' MAC address, and link it to your account.
    You might also have to schedule a technician' visit to measure the connection at your end.
  2. Alabalcho said:
    Call Comcast, you have to provision your modem so that it works - Comcast will record your modem' MAC address, and link it to your account.
    You might also have to schedule a technician' visit to measure the connection at your end.


    The modems already linked to the account.
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