If you are connecting directly to the modem you may need a crossover cable between the computer and the modem. Belkin crossover cables are yellow (at least thats what color the local staples sells). If you are trying it with a straight cable that may be why you are having trouble connecting.
My advice is to connect the router back up and make sure that it is getting an ip address from the internet provider. Depending on who manufacturer is you can access the router management interface with your web browser, get your freind to dig out the manual for their router and it will tell how to access it, if your friend dosen't have a manual, it is also located on the cd that came with it.
JIm
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