Ok so about four months ago i got into my 04 gtp, and noticed that my heads up display was no longer displaying. a while later I started cleaning out my car and noticed that it was in fact still working but had some how managed to get all the way up to the top of the window, or as high as it would go. I tried to hit the button to bring it back down and for some reason it seems to be the only button on that console control that doesn't work. Every other button works just fine, except for adjusting the height back down.

I took it to the stealership and they told me that since i have a after market stereo that it caused some sort of voltage spike that fried the heads up display unit. but it all still works except one button. I have a back ground in Electronics and have been an Electronic's technician in the navy for 4.5 years. Everything i have learned tells me that this is impossible. And I don't know where else to turn for help. Stealership wants 850 bucks to fix it. Any help?