Yellow Triangle Not Going?

I want to ask that I have MU550 HSUPA Wi-Fi Gateway (Product By by my ISP (Saudi Telecom Company) .Problem Is that its not Giving Good Coverage across the house.My Desktop Computer is connected through Alpha adapter because of desktop. Now I have connected Wireless G ADSL Home Gateway ( Device Of LinkSys (CISCO) Model Number WAG200G ) Through Lan Modem On My Desktop PC and Connected to linksys Modem Port to get good coverage of signals across the house .

Only few days its work very well And Getting Excellent Signal Across the house and All Device was working properly and now its not working.Please Guide Me what to do .Before it was working.Without too much configuration.Please Guide whether I have to do any configuration or have to put any ip from my isp to linksys router or not.Please if you can remote my computer or check or simply guide me what to do.

I Shall Be Very Thank-full To You.
Asked Nov 20, 2013

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