Here's our Hardware Tip for.. October 4, 2002
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Cable Modems - Part 2 of 3
Ethernet cards sometimes fail, and generally it's your responsibility to replace them, even if you lease your cable modem and service from your cable company (although some cable providers will service your networking card for a fee).

If you do replace your own Ethernet card, you may have to reset your cable modem before the cable ISP will connect you again. Cable modems often store network address data for your Ethernet card. Thus, if you change cards, you'll need to reset the cable modem to resynchronize.