Did you checked properly whether you ticked on the right port of your DKU-cable ? !!
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Dell Studio 15 -- Core 2 Duo T6400 , 3GB DDR 2 800MHz RAM, 320 GB, ATI Raedon HD 3400 256 MB Graphics Card, 15.4" WLED display, 8x DVD writer, Bluetooth Mouse, WiFi, Ruby Red Color, Creative EP-630
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