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Originally Posted by pmessling
but what about the red power light, shouldn't that be lit whilst its loading etc.
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Normally, yes, the LED should be illuminated while it is loading OS or reading the map. However, I have seen a couple MKIV computers get confused and stuck in a state with the LED off. I think that we got it restarted by disconnecting the unit from power, reconnecting, and then it seemed to boot properly.
TheM@x raises a good point that the computer could be configured for monochrome mode. Check the post he references and see if your MKIV has the second identification sticker with the monochrome or color identifier. However, you said that you initially saw a screen that asked for a software CD. That would lead me to think that your computer is a color unit, since it should never have displayed anything, if it were in monochrome mode.
Your next best bet may be to get NavCoder and buy a computer-to-ibus interface, and try to configure the MKIV yourself. NavCoder is very good at helping determine and correcting a nav computer's configuration.