As of yesterday, I have an A1364 Airport Extreme (4th Gen) connected to a Motorola SB6141 cable (Brighthouse road runner) modem. If I power up the modem then the router, I get internet on the wired computer, but no wifi on the laptop. If I power up router then modem, I get wifi on the laptop, but no connection on the wired desktop computer.
Any ideas? — Just looking for a place to start. Thanks.