This button has two functions:
● When the computer is on, use this button to select the video input-source.
Press the button to switch the display between the internal system display and HDMI input.
● When the computer is off (there is no power; neither is it in sleep state nor hibernate state), use this button to
run the built-in selftest for the display.
Press and hold down this button, and then press the power button to turn on the computer. The built-in color
pattern for the LCD monitor will appear on the screen.
For more information, see the Troubleshooting section in the Service Manual at
www.dell.com/support/manuals.
2. Service tag label
Inside view of your computer
NOTE: The appearance of heat sink differs depending on the graphics configuration you ordered.
1. Wireless card
2. System board
3. Camera assembly
4. Heat sink
5. M.2 2230/2280 solid-state drive/Intel Optane PCIe connector
6. Processor fan
7. Memory modules
8. Hard drive
9. M.2 2230/2280 solid-state drive PCIe connector
10. Side-I/O board
11. Speakers
12. Power-button board
13. Microphones
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