DVD ROMS in NETWORK not working

Ok so imp having a problem with me DVD ROMs in my network. I can burn cds on some of them but not all. But after I put in a blank DVD in the drive it won?t read it at all, or when I click on it tell me incorrect function. I have thought it may be a GPO that was blocking me but I could not find one causing it. Anyone have any thoughts? Oh also I did buy a new set of DVDs just incase I was the most unlucky person around and had a stack of bad disk.