Hey there. I was just going to restore my mac to factory settings because I have a lot of junk on it I want to get rid of. So i back up all my data i want to save and then i inserts my Mac OS X install DVD. But all i does is saying some strange noises and after 20 seconds it pops out again. It is really strange because my mac can recognize all other disks. But not my two DVDs that came with my mac. I have restore my mac once and at that time the DVDs worked fine. So what should i do? I need to restore my mac but it wont recognize my restore DVDs. I really hope someone can help me.