What are the possible power-on error codes for the HP EliteDesk 800 G1?

The device has several red blinking sequences indicating different errors: CPU not installed (3 blinks), power supply overload (4 blinks), video memory error (5 blinks), and system board failure (7 blinks). Each code is detailed in the LED activity section of the manual. (Page 2)

From the official HP Elitedesk 800 G1 Small Form Factor PC manual, page 2

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What does 5 red LED blinks mean on the EliteDesk 800 G1?
The device has several red blinking sequences indicating different errors: CPU not installed (3 blinks), power supply overload (4 blinks), video memory error (5 blinks), and system board failure (7 blinks). Each code is detailed in the LED activity section of the manual. (Page 2)
What LED blink code indicates a system board failure?
The device has several red blinking sequences indicating different errors: CPU not installed (3 blinks), power supply overload (4 blinks), video memory error (5 blinks), and system board failure (7 blinks). Each code is detailed in the LED activity section of the manual. (Page 2)
What do 4 red blinking lights mean on the HP EliteDesk 800 G1?
The device has several red blinking sequences indicating different errors: CPU not installed (3 blinks), power supply overload (4 blinks), video memory error (5 blinks), and system board failure (7 blinks). Each code is detailed in the LED activity section of the manual. (Page 2)

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