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I am running one VGA display using Thunderbolt/VGA adapter from Apple and it works fine.

Trying to connect second VGA display using HDMI/DVI adapter which comes with the mac using an additional connector DVI to VGA, but nothing happens!

I only have VGA monitors, so question is can this be got to work in some way ?

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You cannot run VGA from the HDMI port the way you have it set up. You need a direct HDMI->VGA converter. The reason is that HDMI does not output analog signals. The cable head actually has a digital-to-analog converter chip in it, but your HDMI<->DVI adapter does not. So even though the DVI<->VGA adapter fits, the analog pins aren't actually connected.

Technically, the HDMI<->DVI converter you're using was manufactured incorrectly. They should have used a DVI-D connector, but they used a DVI-I instead. A VGA adapter will not fit onto a DVI-D connector, but a DVI-I connector will accommodate anything.

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