Dell PowerEdge R900 - Manual (Page 132)

132 Troubleshooting Your System
2 If the problem is confined to a particular application, see the application
documentation for specific port configuration requirements that the
program may require.
3 Run the appropriate online diagnostic test. See "Using PowerEdge
Diagnostics" on page 149.
If the tests run successfully but the problem persists, see "Troubleshooting
a Serial I/O Device" on page 132.
Troubleshooting a Serial I/O Device
Problem
• Device connected to the serial port is not operating properly.
Action
1 Remove power from the system and any peripheral devices connected to
the serial port.
2 Swap the serial interface cable with a known working cable, and turn on
the system and the serial device.
If the problem is resolved, replace the interface cable.
3 Remove power from the system and the serial device, and swap the device
with a comparable device.
4 Turn on the system and the serial device.
If the problem is resolved, replace the serial device.
If the problem persists, see "Getting Help" on page 165.
Troubleshooting a USB Device
Problem
• System message indicates a problem with a USB device.
• Device connected to a USB port is not operating properly.
Action
1 Enter the System Setup program, and ensure that the USB ports are
enabled. See "Using the System Setup Program" on page 41.