No connection with Linksys router

[eddy158k]

That is exactly right ... "the modem on it's own works, but not with the router, yet the router with a different modem also works" and yes, I have change the macs numerous times with the same result. Adding to the weirdness this modem was working fine with the same router two days ago. I also tried on another computer with a Linksys router and got the same results. Connection directly, NO connection thru Linksys router.