HP EliteDesk 800 G1 Tower Service Manual page 222

Blank screen and the power LED flashes Red five times, once every second, followed by a two second
pause, and the computer beeps five times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Pre-video memory error.
Blank screen and the power LED flashes Red six times, once every second, followed by a two second
pause, and the computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
Pre-video graphics error.
Blank screen and the power LED flashes Red seven times, once every second, followed by a two second
pause, and the computer beeps seven times. (Beeps stop after fifth iteration but LEDs continue flashing.)
Cause
System board failure (ROM detected failure prior to video).
Monitor does not function properly when used with energy saver features.
Cause
Monitor without energy saver capabilities is being used with
energy saver features enabled.
210 Chapter 9 Troubleshooting without diagnostics
Solution
1.
Reseat DIMMs. Power on the system.
2. Replace DIMMs one at a time to isolate the faulty
module.
3. Replace third-party memory with HP memory.
4.
Replace the system board.
Solution
For systems with a graphics card:
1. Reseat the graphics card (if applicable). Power on the
system.
2. Replace the graphics card (if applicable).
3.
Replace the system board.
For systems with integrated graphics, replace the system
board.
Solution
Replace the system board.
Solution
Disable monitor energy saver feature.