Dell Pro 14 PC14250 Owner's Manual

Before working inside your computer

1. Save and close all open files and exit all open applications.
2. Shut down your computer. For Windows operating system, click Start > Power > Shut down.
   NOTE:If you are using a different operating system, see the documentation of your operating system for instructions.
3. Turn off all the attached peripherals.
4. Disconnect your computer from the electrical outlet.
5. Disconnect all attached network devices and peripherals, such as keyboard, mouse, and monitor from your computer.
6. Remove any media card and optical drive from your computer, if applicable.
7. To clean the air vents, use a soft brush and move vertically.
   NOTE:Do not remove the base cover or use any blower to clean the vents.
8. Enter the Service Mode.

   Service Mode

   Service Mode is used to cut off power without disconnecting the battery cable from the system board before conducting repairs in the computer.

   CAUTION:If you are unable to turn on the computer to put it into Service Mode, disconnect the battery cable. To disconnect the battery cable, follow the steps in Removing the battery.

   NOTE:Ensure that your computer is shut down and the power adapter is disconnected.
   1. Press and hold the B key and the power button for 3 seconds, or until the Dell logo appears on the screen.
   2. If the Owner Tag is set, it is displayed on the screen. Press any key to continue.
      NOTE:If the Owner Tag information is not already set, the computer automatically skips this step and proceeds to enter Service Mode.
   3. If the power adapter is still connected, a message appears on the screen prompting you to disconnect it. Disconnect the power adapter, then press any key to continue.
   4. When the System Ready For Service message appears on the screen, press any key to proceed. The computer emits three short beeps and shuts down immediately.
      The computer shuts down and enters the Service Mode.