Why doesn't thunderbolt-to-dvi-to-vga work?

Macbook Pro (Mid 2011), Mountain Lion, latest version.
I am trying to use an external VGA display from my MBP. Thunderbolt to DVI output works fine. I don't have a Thunderbolt to VGA adapter, so I connected a DVI to VGA adapter to the DVI end of the Thunderbolt to DVI adapter. I get no output in this arrangement, and the MBP does not seem to notice that anything is connected. I've checked the projector and the DVI to VGA adapter, and both are as they should be. Is there some reason this combination doesn't work, and can I do anything to fix it?

fadecomic wrote:
I found out. The Thunderbolt port is digital only, whereas a DVI port outputs analog and digital. There is no analog signal at the DVI end of the Thunderbolt to DVI adapter, so the DVI to VGA adapter has nothing to pass along.
I was wondering if that was the answer but I wasn't sure, so I appreciate that you came back and let everybody know that was the case.

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Why doesn't thunderbolt-to-dvi-to-vga work?

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