I got 149,000 hits from google on that particular modem. You might want to check some links:
http://anonym.to?http://www.google.c...=Google+Search
It seems that particular modem has issues and everyone that posts about it has the same thing happening. If he's using a USB connection, try using a regular ethernet cable instead. There's also some links to flashing the damn thing - which is pretty extreme to get the thing to work, imo. Good routers are really cheap nowadays ($30), so you could just get that and toss that POS out the window. :p
This might be a good read.
http://anonym.to?http://corz.org/com...ter.how-to.php
Hope that helps.