My MacBook Pro plays DVDs with movies on, but no CDs with music, or DVDs with software on them. It just makes a noise for about 30 seconds, then spits them out. What do I do? I know there's a lot about this issue already on the forums/the internet, but I've never come across a fix. I didn't buy my MacBook directly from Apple... will they still fix it if I pay them? Thank you!