IBM 436854u Service Guide - Page 170

Error LEDs The following illustration shows the system-board LEDs. The system board has error LEDs that will help to locate the source of the error. Run the diagnostic programs to find out the cause of the error (see "Running the diagnostic programs" on page 156). Board VRD fault LED Standby power LED Microprocessor fan LED DIMM 1 LED DIMM 2 DIMM 3 LED LED DIMM 4 LED System fan LED Hard drive fan LED Slot 1, PCI Express x8 LED Slot 2, PCI Express x4 LED Slot 3, PCI-X 64-bit 133 MHz LED Slot 4, PCI 32-bit 33 MHz LED Slot 5, PCI 32-bit 33 MHz LED Mini-PCI slot LED Mini-BMC heartbeat LED Microprocessor LED The server is designed so that LEDs remain lit when the server is connected to an ac power source but is not turned on, provided that the power supply is operating correctly. This feature helps you to isolate the problem when the operating system is shut down. Many errors are first indicated by a lit system-error LED on the front-panel assembly of the server. If this LED is lit, one or more LEDs elsewhere in the server might also be lit and can direct you to the source of the error. Important: If the system-error LED on the front of the server is lit but there are no other error indications, clear the BMC system-event log. This log does not clear itself, and if it begins to fill up, the system-error LED will be lit. Also, after you complete a repair or correct an error, clear the BMC system-event log to turn off the system-error LED on the front of the server. Before you work inside the server to view the LEDs, read the safety information that begins on page vii and "Handling static-sensitive devices" on page 50. If an error occurs, view the server LEDs in the following order: 152 System x3200 M2 Types 4367 and 4368: Problem Determination and Service Guide