Can't get internet connection via ethernet

I have had 3 computers, 1 pc and 2 Macs, networked through ethernet for two years. Never had problems until yesterday. We just can't get on the internet on the Macs. Both macs say "Your computer isn't connected." Talked to D-Link router, everything was fine. Macs recognize IP and all numbers, so they told us to call Apple. Any ideas?
Thanks.

Possibly:
reboot the macs.
check the cables.
reboot the router.
reboot the dsl/cable/whatever modem.
Are you getting a valid Ip ddress from the D-Link (192.168.xx.xx, or is it a 169.xxx.xxx.xxx?)
In Network utilities, can you ping an outside IP by name? Ping an outside site by IP by number? Ping the router IP? Ping the PC?
Reset Safari...

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