Solving Display Problems - HP Compaq Pro 6305 Maintenance And Service Manual

Solving Display Problems

If you encounter display problems, see the documentation that came with the monitor and to the
common causes and solutions listed in the following table.
Table 8-5 Solving Display Problems
Blank screen (no video).
Cause
Monitor is not turned on and the monitor light is not on.
Bad monitor.
The cable connections are not correct.
You may have a screen blanking utility installed or energy
saver features are enabled.
System ROM is corrupted; system is running in Boot Block
Emergency Recovery Mode (indicated by eight beeps).
You are using a fixed-sync monitor and it will not sync at the
resolution chosen.
Computer is in standby mode.
Monitor cable is plugged into the wrong connector.
Monitor settings in the computer are not compatible with the
monitor.
Monitor is configured to use an input that is not active.
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.
150 Chapter 8 Troubleshooting Without Diagnostics
Solution
Turn on the monitor and check that the monitor light is on.
Try a different monitor.
Check the cable connection from the monitor to the computer
and to the electrical outlet.
Press any key or click the mouse button and, if set, type your
password.
Reflash the system ROM with the latest BIOS image.
Be sure that the monitor can accept the same horizontal
scan rate as the resolution chosen.
Press the power button to resume from standby mode.
CAUTION: When attempting to resume from standby
mode, do not hold down the power button for more than four
seconds. Otherwise, the computer will shut down and you
will lose any unsaved data.
Systems may have a monitor connection on both the
motherboard or an add-in card. Try moving the monitor
connection to a different connector on the back of the
computer
1. In Windows 7 Control Panel, under Appearance and
Personalization, select Adjust screen resolution.
2. Use the sliding control to reset the resolution.
Use the monitor's on-screen menu controls to select the
input that is being driven by the system. Refer to the
monitor's user documentation for more information on the on-
screen controls and settings.
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.