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There are three LEDs to help you determine if the power supply and system board are working correctly. A power button LED is located on the front of the computer and two diagnostic LEDs are located on the power supply at the rear of the computer. a. Disconnect the power cord from the electrical outlet. b. Reconnect the power cord to a working electrical outlet. c. Press the power button. © Lenovo 2005. Portions © IBM Corp. 2005. 45 d. Observe the LEDs and refer to the following table. Power LED Green diagnostic LED Yellow diagnostic LED Action ON ON OFF This is the normal condition of the LEDs when the power is OK. OFF OFF OFF Make sure the power cord is attached to a working electrical outlet. If the electrical outlet is OK, replace the power supply. OFF (after the power button has been pressed) ON OFF Replace the system board ON ON ON Replace the power supply If the Diagnostic LEDs are in the normal condition and the problem persists, replace the system board and the microprocessor, one at a time, until the computer works correctly. 8. Run the Diagnostic programs. See Chapter 5, “Diagnostics using PC-Doctor for DOS,” on page 49. v If you receive an error, replace the part that the diagnostic program calls out or go to “Diagnostic error codes” on page 61. v If the test stops and you cannot continue, replace the last device tested. Problem determination tips Due to the variety of hardware and software combinations that can be encountered, use the following information to assist you in problem determination. If possible, have this information available when requesting assistance from Service Support and Engineering functions. v Machine type and model v Processor or hard disk upgrades v Failure symptom – Do diagnostics indicate a failure? – What, when, where, single, or multiple systems? – Is the failure repeatable? – Has this configuration ever worked? – If it has been working, what changes were made prior to it failing? – Is this the original reported failure? v Diagnostics version – Type and version levelv Hardware configuration – Print (print screen) configuration currently in use – BIOS levelv Operating system software – Type and version levelNote: To eliminate confusion, identical systems are considered identical only if they: 46 Hardware Maintenance Manual 1. Are the exact machine type and models 2. Have the same BIOS level 3. Have the same adapters/attachments in the same locations 4. Have the same address jumpers/terminators/cabling 5. Have the same software versions and levels 6. Have the same Diagnostics Diskette (version) 7. Have the same configuration options set in the system 8. Have the same setup for the operation system control filesComparing the configuration and software set-up between .working and non-working. systems will often lead to problem resolution. Chapter 4. General Checkout 47 48 Hardware Maintenance Manual Chapter 5. Diagnostics using PC-Doctor for DOS Diagnostics are provided by the PC-Doctor program for DOS. These include a full range of diagnostic utilities to determine the operating condition of the computer’s hardware components. You can the run diagnostics from the Rescue and Recovery™ workspace or you can create a bootable diagnostic diskette from the Rescue and Recovery workspace. Alternatively, you can download either a diskette image or a startable CD-ROM image (.iso file) from the Customer Support Web site and run diagnostics using them. The latest version of the diagnostics program is available from on the World Wide Web. Type your machine type into the Use Quick path field and click Go to find the downloadable files that are specific to the computer. See “Diagnostics program download” on page 50. Diagnostic error messages appear when a test program finds a problem with a hardware option. For the test programs to properly determine if a test Passed, Failed or Aborted, the test programs check the error-return code at test completion. See “Diagnostic error codes” on page 61. If an installed device is not recognized by the diagnostics program, that device might be defective. Starting PC-Doctor from the Rescue and Recovery workspace This procedure describes how to start PC-Doctor from the Rescue and Recovery workspace. 1. If your computer is already on when you start this procedure, shut down the operating system and turn off the computer. 2. To launch the Rescue and Recovery workspace, repeatedly press the F11 key as you turn on the computer. Note: If a user password or an administrator password has been set, the Rescue and Recovery workspace is not displayed until you type the password. 3. When the Rescue and Recovery workspace is displayed, look for .Troubleshoot. on the left side of the screen. Click Diagnose hardware. Notes: a. Additional diagnostic information is available from the Rescue and Recovery workspace, such as a diagnostic overview. Refer to the Rescue and Recovery help system for details. b. After selecting Diagnose ha...

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