I have a similar problem. My Acer travelmate 270 do not detect the internal dvd rom/cdrw (combo). I have Win XP pro installed. The device seems to be working properly (physically) since when cdâ€™s or dvdâ€™s are in it the disks rotate as usual. Iâ€™m not able to find the dvd/cd unit on the explorer, there is not cd unit at all on my computer. This problem could usually be solved by restart the machine but not anymore. Now it is completely dead, as mentioned no optical unit is discovered by win xp.