IBM 8840 Installation Guide - Page 74
Universal, Serial, device, problems, Light, diagnostics - specs
UPC - 000435863799
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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 Your operating system supports USB devices. If the problem remains, call for service. Light path diagnostics Use light path diagnostics to diagnose system errors. The light path diagnostics panel is inside the light path diagnostics drawer, on the right front of the server. To access the light path diagnostics panel, slide the latch to the left on the front of the light path diagnostics drawer. The following illustration shows the controls and LEDs on the light path diagnostics panel. Light Path Diagnostics REMIND OVER SPEC PS1 PS2 CPU VRM CNFG MEM NMI S ERR SP DASD RAID FAN TEMP BRD PCI A PCI B PCI C To acknowledge a system error but not take immediate action, press the remind button and place light path diagnostics in remind mode. When the server is in Remind mode, the system-error LED on the front of the server flashes. If a new failure occurs, the system-error LED is lit again. 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. 60 IBM xSeries 346 Type 8840: Installation Guide