External Monitor plugs in, then goes dark?

Hello-
I have an early-2008 15" MacBook Pro. I purchased it in June of 2008.
The issue I am having is when I am using an external-monitor as a second display. I use a DVI->VGA converter for my external monitor. When I plug it in, my notebook will recognize the external display, it will format the resolution and all, and it will even show the extension-desktop on the external. However, after about two seconds, the external will return back to black (although it does NOT display "no input" like it would if it was turned on with nothing plugged into it).
Any suggestions?
I really appreciate it.
-E.

Hello-
I have an early-2008 15" MacBook Pro. I purchased it in June of 2008.
The issue I am having is when I am using an external-monitor as a second display. I use a DVI->VGA converter for my external monitor. When I plug it in, my notebook will recognize the external display, it will format the resolution and all, and it will even show the extension-desktop on the external. However, after about two seconds, the external will return back to black (although it does NOT display "no input" like it would if it was turned on with nothing plugged into it).
Any suggestions?
I really appreciate it.
-E.

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