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This maybe a bit of a stab in the dark but did you switch off and on the cable modem after trying to switch from usb to ethernet, or from one pc to another?
This is gonna be completely different probably, but my ISP in OZ links the ip address they give you to the single devices mac address when first plugged in. If you want to use a second device plugged into the cable modem, you have to "reset" the cable modem (by switching off then on). Similarly, if going from a pc directly connected to sticking a router in - the cable modem needs to be rebooted.
If the renew ip address fails, you may end up with a "private" address (in the range 169.254.x.x) - this may be caused by an incorrect mac address as above.
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who hid my keyboard's PANIC button?
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