Connecting to HDTV?

I have a MacBook (Aluminum, Late 2008) and I have been trying to connect to my Samsung HDTV using a Mini DVI to VGA adapter. My computer detects the TV display but it won't show anything on the actual TV. The TV just says "Check Signal Cable." Has anyone else had this problem? How do I fix it?

Read this info... http://www.mac-forums.com/forums/other-hardware-peripherals/193239-connecting-your-mac-your-tv.html