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1st step is to take a close look at the rear frame where the roof folds away behind the rear seats - what can happen is the supporting straps and ties for the 'skin' can come away and get tangled up in the hinge mechanisim this can prevent the roof form opening or closing
if this is OK then refer to the handbook as this shows the manual overide operation to allow the roof to be wound shut
OK if you can close the top manually I suggest doing that as the next step and then check the level of hydraulic fluid in the pump reservoir if this is OK then the its possbily a fault with one of the roof position switches on the hinge mechanisim