Compaq D51s Getting Started Guide - Page 12

Basic Troubleshooting Solving General Problems (Continued) Problem Computer appears locked up and will not turn off when the power button is pressed. Computer date and time display is incorrect. Computer powered off automatically and the Power LED is: 1. Flashing Red or Yellow four times per second, OR 2. Flashing Red or Yellow two times one second apart, followed by a two second pause, OR 3. Not flashing. Cause Software control of the power switch is not functional. Solution Press and hold the power button for at least 4 seconds until the computer turns off. RTC (real-time clock) battery may need to be replaced. Battery life is approximately 3-5 years. The unit temperature was exceeded. The fan may be blocked or not turning, OR the heatsink is not properly attached to the processor. First, reset the date and time under Control Panel (Computer Setup can also be used to update the RTC date and time). If the problem persists, replace the RTC battery. Refer to the Hardware Reference Guide for instructions on installing a new battery, or contact your Compaq authorized dealer or reseller for RTC battery replacement. 1. Unit is in an exceedingly hot environment. Let it cool down. 2. Ensure that computer air vents are not blocked and internal fans are running (i.e. power supply fan, chassis fan, and/or processor fan). 3. Ensure that the heatsink is properly seated. Contact Compaq authorized reseller or service provider. The unit temperature was exceeded because the computer was functioning with the cover or access panel removed. Replace cover or access panel, and let the computer cool down before attempting to turn on power to the computer. 2-4 Getting Started