IMac 20" and external LG L1915S display

I've got an external 19" LG display attached to my 20" iMac via mini-DIV to VGA adapter from Apple.
When the iMac is shut down, going to sleep or shuts down the internal display the 19" doesn't go into stand by mode. It did when it was attached to my old G4.
What might be the problem? The "shutdown" signal seems to be missing through the VGA-adapter.

No answers, but I have a similar problem w/ a Dell external VGA display. If my computer goes to sleep on its own or shuts down, the external display stays on w/ the last image frozen in place. The only way to get the external monitor off is to manually put my computer to sleep.
Is it normal for all the controls on the external monitor to stop working?
Curious to hear if you've learned anything. Thanks,
Alex

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