HP Compaq dc7800 USDT Troubleshooting Manual page 32

Table 2-6 Solving Display Problems (continued)
High pitched noise coming from inside a flat panel monitor.
Cause
Brightness and/or contrast settings are too high.
Fuzzy focus; streaking, ghosting, or shadowing effects; horizontal scrolling lines; faint vertical bars; or unable to
center the picture on the screen (flat panel monitors using an analog VGA input connection only).
Cause
Flat panel monitor's internal digital conversion circuits may be
unable to correctly interpret the output synchronization of the
graphics card.
Graphics card is not seated properly or is bad.
Certain typed symbols do not appear correct.
Cause
The font you are using does not support that particular symbol. Use the Character Map to locate the and select the appropriate
26 Chapter 2 Troubleshooting Without Diagnostics
Solution
Lower brightness and/or contrast settings.
Solution
1. Select the monitor's Auto-Adjustment option in the
monitor's on-screen display menu.
2. Manually synchronize the Clock and Clock Phase on-
screen display functions. To download a SoftPaq that will
assist you with the synchronization, go to the following
Web site, select the appropriate monitor, and download
either SP32347 or SP32202:
1. Reseat the graphics card.
2. Replace the graphics card.
Solution
symbol. Click Start > All Programs > Accessories > System
Tools > Character Map. You can copy the symbol from the
Character Map into a document.
http://www.hp.com/support
ENWW