Nero won't recognize blank DVDs

I have a huge problem with my DVD burner. It used to work fine, but recently i tried to burn a DVD and Nero keeps telling me that i have the wrong medium in the recorder, it says that i have a blank CD but i actually have a blank DVD in there. I’ve tried different brands of DVD+R bu i get the same thing. I have no idea how to fix this. I just updated the firmware and still get the same problem…and suggestions anyone?

Sounds live the DVD laser is kaput. All you can do is try to clean the lens (using a cleaning CD/DVD). If that does not work, it’s time to buy a new burner.

is your dvd-burner able to burn the dvd you used (-/+ r, rw)?