Troubleshooting Without Diagnostics

Solving Display Problems (Continued)

Problem

Cause

Solution

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 continue for five iterations after which the LED flashes will continue until the problem is resolved.

System board failure

Replace the system board.

(ROM detected failure

 

prior to video.)

 

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

Monitor without energy

Disable monitor energy saver

saver capabilities is

feature.

being used with energy

 

saver features enabled.

 

Dim characters.

The brightness and

 

contrast controls are not

 

set properly.

Adjust the monitor brightness and contrast controls.

Cables are not properly

Check that the graphics cable is

connected.

securely connected to the graphics

 

card and the monitor.

Blurry video or requested

If the graphics controller

resolution cannot be set.

was upgraded, the

 

correct video drivers

 

may not be loaded.

Install the video drivers included in the upgrade kit.

Monitor is not capable

Change requested resolution.

of displaying requested

 

resolution.

 

 

 

Graphics card is bad.

Replace the graphics card.

The picture is broken up, rolls, jitters, or flashes.

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 field by moving them apart.

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

Monitor needs to be

Degauss the monitor.

degaussed.

 

 

 

D–12

390742-002

Service Reference Guide, dc7600