Hi guys just wondered if any 1 could shed any light on my window problem it goes up about half way, something makes a sort of gritty noise, then it goes back down..... iv had a look, there is nothing preventing it from going up...... iv got it up at the mo after force and persistance, but i wont be able to put it down again incase it gets stuck....will it be an internal motor problem? like the cog inside?