HP EliteDesk 800 G4 Maintenance and Service Guide - Page 97
Solving display problems, causes and solutions listed in the following table. - motherboard
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After installing the media card reader and booting to Windows, the reader and the inserted cards are not recognized by the computer. Cause Solution The operating system needs time to recognize the device if the reader was just installed into the computer and you are turning the PC on for the first time. Wait a few seconds so that the operating system can recognize the reader and the available ports, and then recognize the media inserted in the reader. After inserting a media card in the reader, the computer attempts to boot from the media card. Cause Solution The inserted media card has boot capability. 1. If you do not want to boot from the media card, remove it during boot or do not select the option to boot from the inserted media card during the boot process. 2. During POST (Power On Self-Test), press F9 to modify the boot menu. 3. Change the boot sequence in F10 Computer Setup. 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. Blank screen (no video). Cause Monitor is not turned on and the monitor light is not on. Bad monitor. The cable connections are not correct. You may have a screen blanking utility installed or energy saver features are enabled. System ROM is corrupted; system is running in Boot Block Emergency Recovery Mode (indicated by eight beeps). You are using a fixed-sync monitor and it will not sync at the resolution chosen. Computer is in Sleep state. Monitor cable is plugged into the wrong connector. Monitor settings in the computer are not compatible with the monitor. Solution Turn on the monitor and check that the monitor light is on. Try a different monitor. Check the cable connection from the monitor to the computer and to the electrical outlet. Press any key or click the mouse button and type your password (if set). Reflash the system ROM with the latest BIOS image. Be sure that the monitor can accept the same horizontal scan rate as the resolution chosen. 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. 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 1. In Control Panel, select Category from the View by list, then under Appearance and Personalization, select Adjust screen resolution. Solving display problems 89