Join Date: Nov 2010
Location: Nicosia, Cyprus
Local Time: 08:00 AM
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Does it open back by itself? In most of the cases, the ECU thinks that there is something trapped (high friction) so it will stop the motion and automatically reverse it.
Try to close the roof, by pushing and releasing the button in quick successions. This way you disable the anti-trap mechanism and you can see if the problem is that or not...
If it is, I recommend greasing your rails and then re-calibrating the sunroof's ECU. Since it measures voltage to determine friction, a not-so good battery can also be the cause.