Compaq D51s Getting Started Guide - Page 17

Basic Troubleshooting Diagnostic Keyboard LEDS, Front Panel LEDs and Audible Codes (Continued) Activity Beeps Probable Cause Recommended Action Flashing Num Lock LED on keyboard (on select models.) 1S, 2L* System memory not present. 1. Check memory module (see the relevant section of the Hardware Reference Guide). 2. Remove and reseat memory module. 3. See the "Solving Memory Problems" section of this guide. Ä CAUTION: Some models support ECC memory and non-ECC memory. Other models support only non-ECC memory. For those systems that do support ECC memory, Compaq does not support mixing ECC and non-ECC memory. In addition, the system will not boot the operating system. Num Lock LED ON None (keyboard). Failed Boot Block. Reflash the ROM using a ROMPaq diskette. See the "Failsafe Boot Block ROM" section of the Desktop Management Guide. Flashing Scroll Lock LED on keyboard (on select models.) 2L, 1S* System board hardware failure (prior to graphics). Replace system board. Green Power LED flashes 1x / second. None Computer in normal Suspend mode. None Green Power LED On. None Computer on. None *L = Long, S = Short Getting Started 2-9