I've been burning away quite happily for some time now but all of a suuden my combi drive will not recognise any DVD's i put in it? it recognises CD's ok but not DVD's? I've tried to update my firmware some time ago but ran into problems but it still seemed to work fine after i sorted that. I have a NEC ND-2510A. I clean the drive on a regular basis with a len cleaner disc, but now it won't even recognise that? Not sure what to do next? Can anyone help?