IBM 8685 Hardware Maintenance Manual - Page 155

Note: See "System" on page 162 to determine which components should be replaced by a field service technician. Power problems Symptom FRU/action The server does not turn on. 1. Verify that: v The power cables are properly connected to the server. v The electrical outlet functions properly. v The type of memory installed is correct. v If you just installed an option, remove it, and restart the server. If the server now turns on, you might have installed more options than the power supply supports. 2. If LEDs for CPUs or VRMs are on, verify that: a. A VRM is populated for each microprocessor. b. All microprocessors have the same speed. c. Override front panel pushbutton by turning on switch 7 of SW2; if power comes on: 1) Service processor error. 2) Power reset card. 3. See "Undetermined problems" on page 157. The server does not turn off. 1. Press Ctrl+Alt+Delete. 2. Turn off the system by holding the power-control button for 4 seconds. 3. If server fails during BIOS POST and power-control button does not work, remove the AC power cord. Note: See "System" on page 162 to determine which components should be replaced by a field service technician. Serial port problems Symptom FRU/action The number of serial ports identified by the operating system is less than the number of serial ports installed. 1. Verify that: v Each port is assigned a unique address by the Configuration/Setup Utility program and none of the serial ports is disabled. v The serial-port adapter, if you installed one, is seated properly. 2. Failing serial port adapter. A serial device does not work. For more information about the serial port, see "Serial ports" on page 114. 1. Verify that: v The device is compatible with the server. v The serial port is enabled and is assigned a unique address. v The device is connected to the correct port (see "Input/output connectors" on page 110). 2. Failing serial device. 3. Serial adapter, if installed. 4. System board. Chapter 6. Symptom-to-FRU index 145