The DVD drive in my macbook pro has decided that it no longer wants to read DVDs or CDs. However, it will still will burn CDs and DVDs. If a newly burnt CD is ejected and reinserted the computer will tell me it's blank. CDs and DVDs that are burnt work fine in other computers, CD/DVD players. I've already tried reinstalling 10.6, but it wasn't a reformat and install. Is this more likely a software issue or a hardware issue?