HP dx2480 Hardware Reference Guide: HP Compaq dx2480 Business Desktop MIcrotow - Page 74

Troubleshooting Problem Cause Solution Computer will not respond Computer is in standby to USB keyboard or mouse. mode. Press the power button to resume from standby mode. USB Keyboard does not respond/work Keyboard or mouse is not connected to computer. Connect keyboard and mouse cables to computer. System has locked up. Restart the computer. System USB Keyboard support is not enabled in the F10 BIOS setup. Restart the computer and press F10 to enter BIOS setup. Enter into Integrated peripherals and enable the USB keyboard support. CAUTION: 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. Computer date and time display is incorrect. ! RTC (real-time clock) battery may need to be replaced. . MConnecting the computer to a live AC outlet prolongs the life of the RTC battery. First, reset the Date and Time Properties in the Control Panel (Computer Setup can also be used to update the RTC date and time). If the problem persists, replace the RTC battery. See the Hardware Reference Guide on the Documentation and Diagnostics CD for instructions on installing a new battery. Cursor will not move using the Tohne. Num Lock key may be arrow keys on the keypad. Press the Num Lock key. The Num Lock light should not be on if you want to use the arrow keys. The Num Lock key can be disabled (or enabled) in Computer Setup. Poor performance is experienced. Processor is hot. 1. Ensure airflow to the computer is not blocked. Leave a 4-inch (10.2-cm) clearance on all vented sides of the computer and monitor to permit required airflow. 2. Ensure fans are connected and working properly (some fans only operate when needed). 3. Ensure the processor heatsink is installed properly. Troubleshooting Guide www.hp.com/in 8-13