HP 800 G1 Troubleshooting without diagnostics, List, then under Appearance and Personalization

Blank screen (no video).

Cause	Solution
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 scan
resolution chosen.	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
monitor.	list, 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.

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.

138 Chapter 8 Troubleshooting without diagnostics