IBM 88631SU Service Guide - Page 76
Universal, Serial, problems, Video, Light, diagnostics
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UPC - 000435913135
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Universal Serial Bus (USB) port problems v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See Chapter 3, "Parts listing, Type 8863, 7362," on page 107 to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU). v If an action step is preceded by "(Trained service technician only)", that step must be performed only by a trained service technician. Symptom Action A USB device does not work. 1. Run USB diagnostics (see "Running the on-board diagnostic programs" on page 70). 2. Make sure that: v The correct USB device driver is installed. v The operating system supports USB devices. 3. If a standard PS/2 keyboard or mouse is connected, any USB keyboard or mouse will not work during POST. 4. Make sure that the USB configuration options are set correctly in the Configuration/Setup Utility program menu (see the User's Guide for more information). 5. If you are using a USB hub, disconnect the USB device from the hub and connect it directly to the server. Video problems See "Monitor problems" on page 53. Light path diagnostics Light path diagnostics provides a path that you can follow to help you identify the source of an error. The server must be connected to a power source for the LEDs inside the server to be lit; the server does not have to be turned on for the LEDs to be lit. Press the reset button to reset the server and run the power-on self-test (POST). You might have to use a pen or the end of a straightened paper clip to press the button. 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. Any PCI-X, memory, microprocessor, and VRM LED can be lit again without ac power after you remove the microprocessor tray so that you can isolate a problem. After ac power has been removed from the server, power remains available to these LEDs for up to 24 hours. To view the PCI-X, memory, microprocessor, and VRM LEDs, press and hold the light-path-diagnostics button on the PCI-X board, memory card, or microprocessor board for 30 seconds to light the error LEDs. The LEDs that were lit while the server was running will be lit again while the button is pressed. 60 IBM System x3850 Type 8863, 7362: Problem Determination and Service Guide
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