What should I do if my laptop is not recognizing an external CD/DVD drive after connecting?

1. Check the USB drive is compatible with laptop.
2. Restart your laptop.
3. Draw attention to power settings and make sure it is not in a power-saving mode.
4. Check the USB drivers are up to date.
5. Unplug and plug back in the USB drive.
6. Disable the fast start up option.