HP ProDesk 600 G1 Maintenance And Service Manual page 172

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.
Dim characters.
Cause
The brightness and contrast controls are not set properly.
Cables are not properly connected.
Blurry video or requested resolution cannot be set.
Cause
If the graphics controller was upgraded, the correct graphics
drivers may not be loaded.
Monitor is not capable of displaying requested resolution.
Graphics card is bad.
162 Chapter 8 Troubleshooting without diagnostics
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.
Solution
Adjust the monitor brightness and contrast controls.
Check that the graphics cable is securely connected to the
graphics card (if applicable) or video connector and the
monitor.
Solution
Install the video drivers included in the upgrade kit.
Change requested resolution.
Replace the graphics card.