Hello everybody! I just got my imac from ebay, used but in overall very good condition. It's 24 inch, 3,06 ghz, 4g ram with snow leopard installed and latest updates. It can read DVDs easily, but when I insert a CD, it makes sound like it's trying to read it and then after few seconds it just ejects it. Does anybody know what could be the issue here? Hardware or software?Previous owner said that he didn't have problems, but he mostly used DVDs. Could it be that something got damaged during the transport?