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Universal Serial Bus (USB) port problems
This topic describes USB port problem symptoms and corrective actions.
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 7891," on page 225 to determine which components are CRUs and which
components are FRUs.
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
A USB device does not work.
Light path diagnostics
Light path diagnostics is a system of LEDs on the control panel and on the system board of the blade
server. When an error occurs, LEDs are lit throughout the blade server. If the control panel indicates an
error, use the descriptions of the LEDs to diagnose the problem and take corrective action.
LEDs are available for the following components:
v Battery (base unit only)
v SAS disk drive on both the base unit and the expansion unit
v SSD on both the base unit and the expansion unit
v SSD carrier on both the base unit and the expansion unit
v Management card on the base unit only
v Memory modules (DIMMs) on both the base unit and the expansion unit
v CFFh expansion card option on both the base unit and the expansion unit
v CIOv form-factor expansion card option on both the base unit and the expansion unit
v System board and chassis assembly on both the base unit and the expansion unit
v A "check card below" LED on the expansion unit only
Viewing the light path diagnostic LEDs
After reading required safety information, look at the control panel to determine if the LEDs indicate a
sub-optimal condition or an error.
210
Power Systems: Problem Determination and Service Guide for the IBM PS703 (7891-73X) and PS704 (7891-74X)
Action
Make sure that:
v The correct USB device driver is installed.
v The operating system supports USB devices.
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