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Connect the ROCK Pi 4 to your display with the HDMI cable. Ensure that the source for the
display is switched to the HDMI port you are using.
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Connect the USB keyboard and mouse.
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Connect the power supply to the ROCK Pi 4. The board will begin to immediately. (You
might not see the boot sequence, on Ubuntu Server you will see the login prompt)
Wish you good luck!
Troubleshooting
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https://forum.radxa.com/c/rockpi4/Troubleshooting