I have done a search with no joy - but in case this has allready been answered elsewhere please post me the link.
Anyhoo onto the problem i have been using my 106s for about 2 years with no problems when playing original dvds. (in fact any dvd)
Recently i bought a 108 burner and have connected this to secondary ide as a slave. Since attaching this to my pc i am unable to play original dvds in my 106. When i put a dvd in to the drive it just ejects it, when i put in a copy it plays it fine.
I am not sure if this is related to the issue but i also had the problem where the dvd wouldnt work in DMA mode had to change it to PIO to get it to read anything - though this appears to be an intermittent thing.