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I had that one time and thinking wtf and called my cable company and they said in my area there is a problem and after 2 days of them looking for the problem it was fixed and also ethernet cards go bad and act strange before going out all together and I allways have a extra one on had and funny windows says its working fine and also had a splitter go bad in my basement and had no connection at all and called my cable company and they said no problems so I took my cable modem to the basement and bypassed it and wham the light came on and if I wouldnt have done that they said it would be 4 days before they could check the line from the pole...
hope that helps
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