Burner problems with writing

Hey, I have an HP 740b burner I bought about a year ago, maybe even longer than that. I have had no problems with it since I bought it until now.

The burner can read dvds, play dvds, rip dvds but when it burns them they do not work. I backed up a movie I had and it played alright and it ripped alright, and I even mounted the iso onto a virtual drive and that played alright, but when I went to burn it it didnt work. The dvd in the drive has the information including the title of the dvd and the video_ts and audio_ts folders but wont play in my computer, xbox, or a dvd drive downstairs. It started doing this on sunday and on saturday it was working fine.

Any ideas? Thanks.