HP ProDesk 600 G4 Base Model Small Form Factor PC Manuel d'utilisateur télécharger pdf (Page 78)

Blank screen and the power LED ashes Red seven times, once every second, followed by a two second pause, and the computer beeps

seven times. (Beeps stop after fth iteration but LEDs continue ashing.)

Cause Solution

System board failure (ROM detected failure prior to video). Replace the system board.

Monitor does not function properly when used with energy saver features.

Cause Solution

Monitor without energy saver capabilities is being used with energy

saver features enabled.

Disable monitor energy saver feature.

Dim characters.

Cause Solution

The brightness and contrast controls are not set properly. Adjust the monitor brightness and contrast controls.

Cables are not properly connected. Check that the graphics cable is securely connected to the graphics

card (if applicable) or video connector and the monitor.

Blurry video or requested resolution cannot be set.

Cause Solution

If the graphics controller was upgraded, the correct graphics drivers

may not be loaded.

Install the video drivers included in the upgrade kit.

Monitor is not capable of displaying requested resolution. Change requested resolution.

Graphics card is bad. Replace the graphics card.

The picture is broken up, rolls, jitters, or ashes.

Cause Solution

The monitor connections may be incomplete or the monitor may be

incorrectly adjusted.

1. Be sure the monitor cable is securely connected to

the computer.

2. In a two-monitor system or if another monitor is in close

proximity, be sure the monitors are not interfering with each

other’s electromagnetic eld by moving them apart.

3. Fluorescent lights or fans may be too close to the monitor.

Monitor needs to be degaussed. Degauss the monitor. Refer to the documentation that came with

the monitor for instructions.

70 Chapter 6 Troubleshooting without diagnostics

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HP ProDesk 600 G4 Base Model Small Form Factor PC Manuel d'utilisateur Page 78