HP 7300 manual Table A-5Solving Display Problems, Blank screen no video Cause Solution

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 A-5Solving Display Problems

Blank screen (no video).

Cause	Solution
Monitor is not turned on and the monitor light is not on.	Turn on the monitor and check that the monitor light is on.
Bad monitor.	Try a different monitor.
The cable connections are not correct.	Check the cable connection from the monitor to the computer
	and to the electrical outlet.
You may have a screen blanking utility installed or energy	Press any key or click the mouse button and type your
saver features are enabled.	password (if set).
System ROM is corrupted; system is running in Boot Block	Reflash the system ROM with the latest BIOS image.
Emergency Recovery Mode (indicated by eight beeps).
You are using a fixed-sync monitor and it will not sync at the	Be sure that the monitor can accept the same horizontal
resolution chosen.	scan rate as the resolution chosen.
Computer is in Sleep state.	Press the power button to resume from Sleep state.
	CAUTION: When attempting to resume from Sleep state,
	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.

Monitor cable is plugged into the wrong connector.

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

Monitor settings in the computer are not compatible with the	1. In Control Panel, select Category from the View by list,
monitor.	then under Appearance and Personalization, select
	Adjust screen resolution.
	To access Control Panel in Windows 7, click Start, and
	then select Control Panel.
	To access Control Panel in Windows 8, from the Start
	screen, type c, and then select Control Panel from the
	list of applications.
	2. Expand the Resolution box, and then use the sliding
	control to reset the resolution.
Monitor is configured to use an input that is not active.	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.

158 Appendix A Troubleshooting Without Diagnostics