IMac video through AV amp to Plasma?

Hi folks, I was wondering if anyone has any advice on the following problem I'm having.
First of all the kit I'm using:
Intel Core Duo 2 iMac (17 inch),
Denon AVR-1906 AV Receiver,
Panasonic PWD8 42' Plasma,
Apple mini DVI to VGA adapter,
VGA to Component Video Lead.
I'm trying to connect my iMac to the Denon AV amplifier to feed the video signal out of the iMac via the mini DVI to VGA to the component-in on my AV receiver then to my plasma.
So far I'm drawing blanks as when I connect the mini DVI to VGA adapter to my iMac, the iMac isnt seeing a display as connected (even though its connected at the other end to my AV receiver which is on and connected to my plasma).
Anyone know if this works or should I just remove the AV amp from the connection and go straight from the iMac to the plasma (which I know works)?
Thanks!

Thanks for that, that makes sense, the more I think about them ore I think its not going to work.
As the VGA cable connected to the iMac (via DVI) is using only 3 of the D sub pins (one for red, green and blue) there's no way of the iMac detecting that there is a display connected.
Unless of course I can 'fool' the iMac into thinking something is connected, maybe at a software level. is this possible?

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