My brother has a PowerMac G5 that I recently upgraded his CD burner to a new DVD burner, SAMSHS222NBLS. He has used it before with DVD+Rs and it works fine. He ran out of discs and as it has Lightscribe support, he bought them. Now the burner won't recognize the discs at all, as soon as he shuts the tray, the computer "reads" the disc and spits it out. Does anyone know what is causing this? He tried multiple discs, so it's unlikely a medium error and the drive is hardly 3 months old, so it's unlikely it's a drive error. It doesn't make any sense. Any advice is greatly appreciated. Thanks.