Posted 15 September 2007 - 02:06 PM
Another possibility is that you never powered-off the modem itself.
The following may not work with your ISP, but for many ISPs, I think it will:
Whenever you change the device (i.e., a single computer or a router) that is directly/physically connected to the modem, you must first power-off EVERTHING, then power-on the modem (modem only -- no other devices) and wait for the modem lights to stabilize (indicating a good connection to your ISP). Then, power-on the single device directly connected to the modem (there can usually be only one -- either a computer or a router) and wait for it to stabilize (e.g., look at the router's lights). Then, power-on everything else.
I know this sounds like "magic", but basically, the modem remembers the MAC (Media Access Control) address of the device that first connected to it (the modem) after the last time the modem was powered-up and was initialized properly by communicating with the ISP. The modem will communicate only with that single device (i.e., a specific router or a specific computer).