- Notes, cautions, and warnings
- Working on your computer
- Technology and components
- Removing and installing components
- Troubleshooting
- Getting help
CAUTION: : To avoid losing data, save and close all open files and exit all open programs before you turn off your computer or remove the side cover.
NOTE: : Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your operating system, press and hold the power button for about 6 seconds to turn them off.