HP Dc5700 HP Compaq dc5700 Business PC Service Reference Guide, 1st Edition - Page 167
Solving Minor Problems, Problem, Cause, Possible Solution, standby, Control Panel, Num Lock - windows sound drivers
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Troubleshooting Without Diagnostics Solving Minor Problems Solving Minor Problems Problem Cause Computer appears locked up and will not turn off when the power button is pressed. Software control of the power switch is not functional. Computer will not respond to USB keyboard or mouse. Computer is in standby mode. Computer date and time display is incorrect. Computer appears to pause periodically. System has locked up. RTC (real-time clock) battery may need to be replaced. ✎ Connecting the computer to a live AC outlet prolongs the life of the RTC battery. Network driver is loaded and no network connection is established. Cursor will not move using the arrow keys on the keypad. There is no sound or sound volume is too low. The Num Lock key may be on. There is no sound or sound volume is too low. Possible Solution 1. Press and hold the power button for at least four seconds until the computer turns off. 2. Disconnect electrical plug from outlet. Press the power button or press any key to resume from standby mode. Ä When attempting to resume from standby mode, 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. Restart computer. 1. Reset the date and time under Control Panel. Computer Setup can also be used. 2. Replace the RTC battery. Establish a network connection, or use Computer Setup or Microsoft Windows Device Manager to disable the network controller. Press the Num Lock key. The Num Lock key can be disabled (or enabled) in Computer Setup. 1. Check the F10 BIOS settings to make sure the internal system speaker is not muted (this setting does not affect the external speakers). 2. Make sure the external speakers are properly connected and powered on and that the speakers' volume control is set correctly. 3. Use the system volume control available in the operating system to make sure the speakers are not muted or to increase the volume. Service Reference Guide, dc5700 437804-001 D-3