Hi. I bought an MK III as a replacement that supossedly has never been installed in a vechile. It came in the original box and it looks new. When I installed it the red LED light does not come on although you can insert a cd and it will spin and try to read it before ejecting it. So, it has power. The screen in the car is completely blank with no menu items. I tried inserting a software upgrade disk that I have used successfully in the past (v.28) but the same thing happens and it does not install. When these units leave the factory is the software pre-installed? Is there anything else I can try to get it up and running? Thanks in advance for your help. I hope I don't own a paperweight.