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Posted by
New Visitor
Member Since: ‎03-07-2009
Posts: 3

New PC won't connect to old Modem

I have a new PC (Dell XPS 8300) that I am trying to connect to my 6 year old cable modem, but it won't connect.  The modem is a Motorola SB5100.  I have tried several times using the online instructions from Comcast and Motorola, without success.  Right now I am using the old PC and the old modem with no problem. Any suggestions?

Posted by
Cable Expert
Member Since: ‎06-27-2009
Posts: 12,143

Re: New PC won't connect to old Modem

A direct connection to the modem or is there a router? Did you powercycle the modem?

Posted by
New Visitor
Member Since: ‎03-07-2009
Posts: 3

Re: New PC won't connect to old Modem

Direct connection between modem and PC.  Did not power cycle modem because it continues to work fine with old PC - I am on that connection now.  Old PC has Windows XP and new has Windows 7.  Comcast instructions say to set properties for TCP/IP version 4 on networking tab but old modem may not work with V4?

Posted by
Connection Expert
Member Since: ‎12-24-2003
Posts: 46,489

Re: New PC won't connect to old Modem

You need to properly powercycle the modem for it to recognize the new machine.

Posted by
New Visitor
Member Since: ‎03-07-2009
Posts: 3

Re: New PC won't connect to old Modem

I powercycled the modem and now have internet access.  I am on the new PC right now.  Thanks for the info.  When all else fails, hit the beast between the eyes with a 2x4, also known as pulling the plug.

Posted by
Connection Expert
Member Since: ‎12-24-2003
Posts: 46,489

Re: New PC won't connect to old Modem

Glad you got it sorted out ! :smileyhappy:

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