Nothing happens at all
Usually electricalWhat's happening
A completely silent roof is usually an electrical story: a failed motor, a tired microswitch that no longer tells the module the latch is where it should be, or a control module that's lost its calibration and refuses to move until it knows where the roof is. These systems are deliberately cautious: one missing signal and the whole sequence stays parked.
Why generalists get it wrong
Without roof-specific diagnostics, the temptation is to replace the most expensive thing in sight and hope. We've seen new motors fitted to roofs whose only fault was a microswitch: the part was fine, the message wasn't getting through. A roof that won't move is a sentence; you have to read the whole thing, not just the loudest word.
What we do
We plug into the roof's control system and read what it's actually complaining about, then test the motor, switches and wiring against that story. Repair what's broken, recalibrate the system, cycle-test it, across Audi, Mercedes-Benz, BMW, Porsche, Mazda MX-5 and most other makes.