I had the same problem on the Gateway 2701HG-B supplied from ATT. From searching the web, I learned these variety of
modems apparently have an expiration date on the power cord at abotu 18 mos to 2 years. Mine is almost exactly at 2 yrs.
I
replaced the power cord and now it works fine. You can order the OEM replacement from att e-store or try Radio Shack for a universal cord.
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