Had my AT&T 2Wire DSL modem fail on me last week. Red power light was the main symptom. Long story short, these models are known to have their power supply (aka wall wart) become weak over time. When going through the AT&T help, it was looking like I may need a new modem but plugging in another 5.1V 2.0A transformer into the unit brought it back up like before.
I measured the power soming out of the old power supply connector and it measured 5.2V, but under load (plugged into the DSL modem) it dropped below 4V, thereby tripping the red power LED. You can get replacements on ebay, but I went to radio shack and picked up a switchable power supply because I couldn't trust the 2Wire brand of power supplies.
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