My brothers Plextor buggered up so he took it back because it was still under warranty. They told him that the burners only had a certain amount of "wright life". He out-wrote his burner within the warranty and they said he was a CD-Burning freak (whore) lol.
welcome to the world of acer burners :( last year i bought one and within 2 weeks it died and destroyed my hard drive (well, just erased the boot sector) go with another brand like sony or creative or something, they might be expencive but at least they work!