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 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
2. Service tag label
Inside view of your computer
NOTE:
The appearance of heat sink differs depending on the graphics configuration you ordered.
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