IBM 86481BU Installation Guide - Page 82
Universal, Serial, device, problems, System-board, error
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Universal Serial Bus device problems Symptom A USB device does not work. Suggested action Make sure that: v You are not trying to use a USB device during POST if a standard (non-USB) keyboard is connected to the keyboard connector. If a standard (non-USB) keyboard is connected to the keyboard connector, the USB is disabled, and no USB device will work during POST. v The correct USB device driver is installed. v The operating system supports USB devices. If the problem remains, call for service. System-board error LEDs The following illustration shows the LEDs on the system board. You might need to refer to this illustration when solving problems with the server. Fan 1 error LED DIMM 6 error LED DIMM 5 error LED DIMM 4 error LED DIMM 3 error LED DIMM 2 error LED DIMM 1 error LED Fan 2 error LED Fan 4 error LED Fan 3 error LED (reserved) Microprocessor 2 error LED Microprocessor 1 error LED 68 xSeries 226 Type 8648: Installation Guide