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No lights/dead sounds like a power issue. Did prior modem have an external power adapter? If so, easy to check output with a multimeter. External power "blocks" are easy and inexpensive to replace.
The Comcast tech should have had a multimeter, but isn't incented to diagnose customer-owned equipment. Tech and Comcast would rather you rent because it is profitable for the company and limits the amount of troubleshooting they have to do. Doubt they "killed" the one you have though.
Comcast/Xfinity publishes a checklist of modems/routers that work by download speed and service area. Purchase vs rent depends on personal objectives.
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08-08-2017, 12:04 PM
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