First I thought it was my PC but now it seems the 4 LAN ports on my 2800G have stopped working. :evil:

I can still connect wirelessly but if I connect any one of my 3 PCs to any port on the rear of the unit it is unable to access the internet.

Lights show on P1/P4 (depending on port connected) and windows will show when an RJ45 is plugged in or pulled out, but the LAN icon in windows shows an exclamation mark (limited/no connectivity).

No data passes when trying to browse the web. It's the same on all 3 PCs. Restoring the router to factory settings has no effect.

Is it goosed?

check the dhcp is enabled (default)
do an ipconfig to see what is happening.
reflash the router.

Also make sure it's not a speed (10/100) or duplex issue.