No power to IVA-d900
That should be the only power connections that are required for the unit to power up. If you have power really the only thing it could be is either a fuse if there is one on the head unit itself (I think that has a 10 amp) or inline or you have a faulty unit. Most or all of the in-dash screen type head units have a wire that has to be connected to the parking brake but that is usually only to prevent watching the screen while driving. So it shouldn't be that but might be something to check. Hope that helps you out.
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