Bottom - Dell OptiPlex 7480 All-In-One Setup And Specifications

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1. Display Built-in Self Test button
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 self-
test 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
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