Just in case you didn't think of it -- you definitely need to power-cycle (turn off for ~10 seconds, turn back on) the cable modem when you switch from USB to ethernet, or from a direct connection to your PC to router.
Router problem - by LittleK on 07-10-2007 at 03:24 PM RE: Router problem - by ShawnZ on 07-10-2007 at 03:26 PM RE: Router problem - by LittleK on 07-10-2007 at 03:29 PM RE: Router problem - by Voldemort on 07-10-2007 at 04:16 PM RE: Router problem - by Adeptus on 07-10-2007 at 04:37 PM RE: Router problem - by LittleK on 07-10-2007 at 05:08 PM