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Trouble connecting laptop to external monitor

Hey, I have an HP Pavilion g7 with Windows 7 and I've recently been trying to extend my screen to an old LCD computer monitor I have using a VGA connection. I can connect it to the computer fine at first, but after about two or three seconds the external monitor goes dark. I can still faintly my background on the display, so I think the backlight just shut off, but it's not enough to actually see what's going on and I can't figure out how to get it back.

I frequently connect my computer to my TV with an HDMI cord, if that helps any.


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Clarification Request
Try this display on another PC.

In reply to: Trouble connecting laptop to external monitor

I often find I need to try this display on another PC and another display on this PC to sniff out where the problem is.

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Didn't work

In reply to: Try this display on another PC.

I tried it with a different PC and a different power cord and it continues to do the same thing...

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This can mean the display is bad.

In reply to: Didn't work

It's exactly why we did this test.

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