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About a month ago my s33v2 starting making a high pitched whining noise.  At that time the internet was slow but power cycle fixed it (the internet, not the whining noise).

Now the modem seems to have stopped working completely.  I power cycled the modem and router several times, tried multiple cables (both to router and directly to PC) and neither the router nor PC detects any connection.  Checked with xfinity and their service is fine but no modem is detected.  Held reset for awhile but still nothing.

Modem is still under warranty but support is closed today.  Any advice?

  1. try a different power supply. The whining noise is usually from a failing power supply. You might find an old matching one siting around as its pretty common. Just make sure the voltage and polarity are EXACT. The amperage can be more but not less. 

thanks, i did see a previous post that changing power supply could work, but unfortunately couldn’t find a compatible one in my box of old stuff… just ordered a new one so we’ll see in a couple days.  (fwiw, the whining is definitely coming from the modem itself, and not the power supply)

are you within warranty? You can contact support

If the problem persists after trying all the possible troubleshooting steps, I would suggest visiting www.arris.com/consumersupport for further assistance.

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