Mac mini with minidisplayport to vga adapter: display does not sleep

I have a late 2009 mac mini. When using a mini displayport-vga adapter from Apple, whenever the mini puts the display to sleep the video goes black and my monitor goes into test mode (not sleeping).
It's almost like the signal to tell the display to sleep is not passing through the adapter. I have a Dell 2007WFP.
It works correctly with a minidvi-dvi adapter, but I have another computer connected via dvi so I would like to keep the mini on vga.

The dell would not go to sleep, ever.
For anyone else having the same issue, I got it resolved. I got another VGA cable and it now works perfectly. It is possible the cable I was using was older and didn't have a required wire or maybe was broken.

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