Compaq Compaq Evo Desktop, 177620-006 manual Solving Display Problems

Troubleshooting Without Diagnostics

Solving Display Problems (Continued)

Problem	Cause	Solution
Blank screen. (continued)	Monitor cable is	If the computer system has both an
	plugged into the wrong	integrated graphics connector and
	connector.	an AGP card connector, plug the
		monitor cable into the AGP card
		connector in the expansion card
		area on the back of the computer.
	The VGA/BNC	Set the selector switch to agree
	selector switch is not	with the cable connection.
	properly set.

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.

Graphics colors are	The cabling or monitor	1. If you are using BNC cables,
wrong.	impedance is incorrect.	be sure that the Red,
		Green, and Blue BNC
		cables are connected to
		the corresponding monitor
		connectors.
		2. Be sure your monitor’s RGB
		inputs are set to 75 ohms.
Dim characters.	The brightness and	Adjust the monitor brightness and
	contrast controls are	contrast controls.
	not set properly.
	Cables are not properly	Check that the graphics cable is
	connected.	securely connected to the graphics
		card and the monitor.

The RGB switch on the back of the monitor is incorrectly set.

Set the RGB switch (and sync options, if this option is available) to 75 ohms, with the sync set to external. See the documentation included with the monitor.

2–16 Troubleshooting Guide