My velux window is jammed shut!?

I had an electric velux window fitted a few years ago. It worked perfectly until I bought some electric blinds. During the process of fitting the blind in one room the blind in my bathroom stopped working. I tried shutting off the electric and operating it manually but it just wont budge - at all. Its open for trickle flow but thats it. I can't even shut the trickle flow. I have tried turning the electric back on and resetting & nothing happens. Can anyone advise me?

Greenfingers
July 2009