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GMC Wayne,
Your mirror sounds like it was somehow damaged. When damaged, the fluid in the mirror can leak out. Once oxygen gets to the fluid and power is supplied to dim it, it will turn to a purple/black. I'd guess that the glass was improperly installed to the motor back, which will cause distortion if not fully snapped in place, thus cracking or breaking the seal on the mirror causing the fluid inside to degrade. You'll need a new mirror.
Bevl,
You can turn you dimming feature off at the mirror by holding the button farthest to the left for approx 3-6 seconds. The green LED to the left of the button will turn off when the dimming feature is turned off. The feature will turn back on automatically with each ignition cycle because too many people were accidentally turning it off and didn't know how to turn it back on. Why would you want to turn if off in the first place?
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