IBM HS20 Hardware Maintenance Manual - Page 72

System board LED locations Figure 31 shows the location of the LEDs on the system board. You might need to refer to this illustration when solving problems with the blade server. You need to remove the blade server from the BladeCenter unit, open the cover, and press the light path diagnostics button to light any error LEDs that were turned on during processing. Processor mismatch error LED (CR110) Processor 2 error LED (CR13) NMI error LED (CR17) Temperature error LED (CR31) System board error LED (CR30) Light path diagnostics power present LED (CR111) Reserved (SW3) Light path diagnostics button (SW4) IDE bus 1 error LED (CR14) IDE bus 2 error LED (CR28) DIMM 1 error LED (CR3) Processor 1 error LED (CR12) DIMM 2 error LED (CR5) DIMM 3 error LED (CR4) DIMM 4 error LED (CR6) Figure 31. System board LED locations Note: Power is available to relight the light path diagnostics LEDs for a short period of time after the blade server is removed from the BladeCenter unit. During that period of time, you can relight the light path diagnostics LEDs for a maximum of 25 seconds (or less, depending on the number of LEDs that are lit and the length of time the blade server is removed from the BladeCenter unit) by pressing the light path diagnostics button. The light path diagnostics power present LED (CR111) lights when the light path diagnostics button is pressed if power is available to relight the blade-error LEDs. If the light path diagnostics power present LED does not light when the light path diagnostics button is pressed, no power is available to light the blade-error LEDs and they will be unable to provide any diagnostic information. 62 BladeCenter HS20 Type 8832: Hardware Maintenance Manual and Troubleshooting Guide