Cannot read DVDs

My AOpen DUW1608/APR DVD r/w drive doesn’t seem to read some of my DVD-r’s. It’s strange because only one DVD will load and that is quite scratched where other are not.

What happens is that I’ll insert my DVD and the green light will flicker and then nothing. I will check the drive but it appears empty.

This only really started to happen after a reformat of XP.