Superdrive Problems


I have a 3 year old eMac... I recently upgraded my internal HDD to a seagate 120gb drive.... Everything was fine till I recently tried to open a DVD-r I had burned to backup some of my data... The data was burned to the disk using The OS X utilities. The disk was untill now readable. Now when I insert the disk(s) it makes a few sounds as if its thinking about loading and then spits it back out... It does that for all dvd-r/+r and DL disks... Even the ones I burned on this computer. I tried to fix the permissions using disk utilities and that shortened the list of problems but still did not solve anything... PLEASE Help...