Mac Mini mid 2011 Mini Dvi to VGA problems

I have a mac mini mid 2011 and I have to connected to a display in work.  The display only has a VGA entrance, so i bought a mini dvi to vga adapter from my local mac store, but when i connected to the display everything looks odd, the whole display has an odd purple look, I have tried to use a different VGA cable but keep having the same problem, I even tried a different display with the same results, anybody knows why this happens and how to fix it?

Your welcome!
On your end before returning the Adapter,
try > Resetting the System Management Controller
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
and > About NVRAM and PRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
then if that doesn't help, return the adapter and explain the problem to the Apple tech person at the store.

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