"check signal cable" screen saver

I was enjoying my Mac-Mini with a third party monitor, that seemed to work well together, but the only problem with it was that the OSD always came up. So I bought a new monitor (LG E1940). I've first tested it with the previous monitors VGA cable, and as soon I connected the monitor with that cable, the typical "check signal cable" message disappeared, regardless the cable other ends was not yet connected. Regardless the monitor proved to be working with the Mac-Mini.
When I replaced with the slim one that is shipped with (because the other is a bulky cable, and the manufacturer made the connector stick right out in to the wall) the "check signal cable" message still present, after I plugged both end of the cable. At first I was surprised, and despite the message, I booted up the system, and the monitor works. But every time, the system does not sends any signal, the "check signal cable" message comes up.
Then I checked it on my (non-apple) laptop, and right after I connected both ends of the cable, one in the laptop, the "check signal cable" went away.
I'm using a mini-DVI to VGA adapter shipped with my Mac (for the Mac), and I'm suspecting that it is a defect in that adapter. Or this is the normal behavior?

Does the Mac mini (Late 2009) supports the VESA Display Power Management Signaling (I learned about it right now,) through the mini-DVI to VGA adapter?

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