Next step will be to figure out what lights are lit on it.
However your "get a different thingie" is probably a better next step, because it is not safe to connect Windows boxes to Comcast using Switches. They don't provide any Firewall protection from incoming bad guys.
That is exactly what the new thingie looks like . . .
Tomorrow I plan on exchanging the new swich thingie for a router thingie.
(r u mpresed i have lrned the lingo)