|An exclamation mark on a device means one of these.. |
1. The device cannot start
2. The device is missing drivers.
Never heard of the second case in a dvd drive since all of them are ready to go without any installation. So we're talking about the 1st case. Check the cables, make sure nothing is loose (do turn off your pc first). If all else fails, buy a new one, they are so cheap (15-20$).