HP 260 Maintenance and Service Guide - Page 66

Computer date and time display is incorrect. Cause Solution NOTE: Connecting the computer to a live AC outlet prolongs the life of the RTC battery. Replacement section for instructions on installing a new battery, or contact an authorized dealer or reseller for RTC battery replacement. To access Control Panel in Windows 7, select Start, and then select Control Panel. To access Control Panel in Windows 8.1, from the Start screen, type c, and then select Control Panel from the list of applications. Cursor will not move using the arrow keys on the keypad. Cause The Num Lock key is turned on. Solution Press the Num Lock key. The Num Lock light must be off if you want to use the arrow keys on the keypad. You can also disable or enable the Num Lock key in Computer Setup at Advanced > Device Options. There is no sound or sound volume is too low. Cause System volume may be set low or muted. Solution 1. Check the Computer Setup 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. Poor performance. Cause Processor is too hot. Hard drive is full. Low on memory. Hard drive fragmented. 58 Chapter 6 Troubleshooting without diagnostics Solution 1. Make sure airflow to the computer is not blocked. Leave a 10.2-cm (4-inch) clearance on all vented sides of the computer and above the monitor to permit the required airflow. 2. Make sure fans are connected and working properly (some fans only operate when needed). 3. Make sure the processor heat sink is installed properly. Transfer data from the hard drive to create more space on the hard drive. Add more memory. Defragment hard drive.