IBM 86655RY Hardware Maintenance Manual - Page 37

Diagnostic error message tables For descriptions of the error messages that might appear when you run the diagnostic programs, see "Diagnostic error codes" on page 220. If diagnostic error messages appear that are not listed in those tables, make sure that the server has the latest levels of BIOS, Advanced System Management Processor, ServeRAID, and diagnostics microcode installed. Light path diagnostics The server has LEDs to help you identify problems with some server components. These LEDs are part of the light path diagnostics built into the server. By following the path of lights you can quickly identify the type of system error that occurred. Power supply LEDs The AC and DC power LEDs on the power supply provide status information about the power supply. See "Installing a hot-swap power supply" on page 76 for the location of these LEDs. See "Power checkout" on page 31 for more information on power problems. DASD1 RENDON SPOEVCER SMI MEM PS1 NMI CPU PS2 SP VRM PS3 PCIA FAN PS4 PCIB TEMP PCIC 1 AC power light 2 DC power light The following table describes the AC and DC power LEDs. AC power LED DC power LED Description and action On On The power supply is on and operating correctly. Diagnostics 27