Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 32)

The system supports only one monitor attached to either the front or rear video connector. When a monitor is
connected to the front panel, the back-panel video, and PS/2 keyboard and mouse connectors are disabled.
If two monitors are attached to the system, disconnect one monitor. If the problem is not resolved, continue to step 2.
2. Check the system and power connections to the monitor.
3. Run the video tests in system diagnostics.
If the tests run successfully, the problem is not related to video hardware. Go to " Finding Software Solutions ."
If the tests did not run successfully, see " Getting Help " for instructions on obtaining technical assistance.
Troubleshooting the Keyboard
Problem
System error message indicates a keyboard problem
Action
1. Determine whether the system has monitors attached to both the front and rear video connectors.
The system supports only one monitor attached to either the front or rear video connector. When a monitor is
connected to the front panel, the back-panel video, and PS/2 keyboard and mouse connectors are disabled.
If two monitors are attached to the system, disconnect one monitor. If the problem is not resolved, continue to step 2.
2. Depending on the type of keyboard you are using, do one of the following:
a. If you are using a USB keyboard and your system fails to boot, verify that the USB option is enabled in System
Setup. If the problem is not resolved, continue to step 3.
b. If you are using a PS/2 keyboard, skip to step 4.
3. Disconnect any PS/2 mouse from the USB keyboard and connect a PS/2 mouse to the front- or back-panel PS/2 mouse
connector on your system.
NOTE: If a PS/2 mouse is connected the front-panel PS/2 connector, you must use a keyboard/mouse cable adapter.
If the problem is not resolved, continue to step 4.
4. Look at the keyboard and the keyboard cable for any signs of damage.
If the keyboard and its cable appear to be free of physical damage, and the keys work, go to step 6.
If the keyboard or its cable are damaged, continue to step 5.
5. Swap the faulty keyboard with a working keyboard.
If the problem is resolved, the keyboard must be replaced (see " Getting Help " for instructions on obtaining technical
assistance).
6. Run the keyboard test in system diagnostics.
If you cannot use the keyboard to select the keyboard test, continue to step 7.
If the test did not run successfully, see " Getting Help " for instructions on obtaining technical assistance.