There are no switches involved. I replaced the Cisco router with the FIOS router.
Both PCs can see the Internet just fine? Maybe there's a speed/duplex mismatch thats making one of the machines somewhat invisible on your network.So, when everything's plugged into the Cisco, the two PCs can see each other fine, but when they're plugged into the Actiontec, then they can't see each other?
The Actiontec can't see the bedroom PC at all.
Have you tried more than one of the lan ports in the back of the Actiontec? Wondering if you may have a bad port on the Actiontec itself.