I have a late 2008 Macbook Pro. It burns DVDs just fine, but I cannot burn a CD-R. When I insert a CD-R, it reads it for a few seconds, then spits it back out at me. If I'm trying to burn a data disc with Finder, the dialogue will just sit there saying something to the effect of 'waiting for writable media', or something like that. But when I insert the disc, again, it just spits it back out. I've tried two different brands of writable disc and neither works. I've concluded there must be something else wrong. I don't burn discs often, but I'm pretty sure the last time I did successfully was before upgrading to Snow Leopard. I suppose it could have something to do with that. Does anyone know what might be wrong?