Adsl light on modem

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Does anyone know why the adsl light goes off on the modem and you loose your internet connection. The phone wires were all changed,the box where you plug phone and high speed was changed 5 times,i returned the modem to telus quebec and they sent me a new one but i still have the same problem. This is getting to be boering. I spend more time plugging and unplugging my internet connection then i do online. I also took my computer to a repair shop{circuit city} and there is nothing wrong with the computer. I`m really at my witts end with all of this. Please help!