HP dvd640 problem (another one!)



I’m sure this is answered somewhere in the forum but I couldn’t find it. I’ve had a dvd640 for a while and when I first bought it I made a couple dvds of home movies and it worked fine. Ever since then when I put a blank dvd in (-R or +R, either one) it won’t recognize it as blank media. I’ve tried countless different burning software programs, reinstalled the disk that came with the drive, and downloaded the updates… Still nothing. Anyone have a clue about this thing? Thanks…