External Display wil not work when I close my MacBook Pro

Help! I'm using a Vizio LCD with Bluetooth Keyboard and Mouse and I'm trying to use just the display with the MacBook Closed and Powered, but as soon as I do that the Screen on the VIzio dies. I worked for a while but now it won't work anymore. I can here the mouse and keyboard working but the screen on the Vizio will not display anything. bought a the only thing that I'm thinking is that i bought a cheap HDMI to DVI cable at Walmart..could that be the problem? Any feed back would be welcome. Thanks

6 With the computer turned on and your wireless keyboard or mouse paired, connect the other end of the adapter to the video output port on your MacBook Pro.
7 Once your computer's Desktop appears on the external display, close the MacBook Pro lid.
8 Once it's closed, wake the computer up by either clicking your Bluetooth mouse button or by pressing a key on your Bluetooth keyboard.
You mean it never wakes the external monitor at this point?
http://docs.info.apple.com/article.html?artnum=300562

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