HP 402 G1 manual Screen resolution

Table 7-5Solving Display Problems (continued)

Blank screen (no video).

Cause	Solution
Monitor settings in the computer are not compatible with the	1. In Control Panel, select Category from the View by list, then
monitor.	under Appearance and Personalization, select Adjust
	screen resolution.
	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.

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	Solution
Pre-video memory error.	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.

Blank screen and the power LED flashes Red six times, once every second, followed by a two second pause, and the computer beeps six times. (Beeps stop after fifth iteration but LEDs continue flashing.)

Cause	Solution
Pre-video graphics error.	For systems with a graphics card:
	1.	Reseat the graphics card (if applicable). Power on the
		system.
	2.	Replace the graphics card (if applicable).
	3.	Replace the system board.

For systems with integrated graphics, replace the system board.

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 stop after fifth iteration but LEDs continue flashing.)

Cause	Solution
System board failure (ROM detected failure prior to video).	Replace the system board.

68 Chapter 7 Troubleshooting without diagnostics