Dell Precision 390 Troubleshooting

Written by ruri ranbe
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The Dell Precision 390 is a workstation computer designed to handle graphic- and memory-intensive applications. The Dell Precision 390 was released in the mid-2000s, and due to the age of the computer, you should not overlook the possibility of hardware failure.

The Dell Precision 390 comes with an internal troubleshooting tool called Dell Diagnostics. Dell Diagnostics scans the computer for errors and suggests steps to resolve detected issues.

Skill level:
Moderately Easy


  1. 1

    Confirm the power cable is connected to the rear of the system and to an active power outlet.

  2. 2

    Confirm the monitor is receiving power and that the VGA, DVI or HDMI cable is connected securely to the monitor and to the rear of the computer. Turn on the monitor.

  3. 3

    Turn on the Dell Precision 390. Listen for a series of beeps, which indicate a problem with the hardware. If you hear more than one beep when turning on the system, review the beep code meanings on the Dell website (see Resources).

  4. 4

    Restart the computer. Press "F12" when the Dell logo appears on-screen to run Dell Diagnostics.

  5. 5

    Use the directional pad to select the "Boot to Utility Partition" option. Press "Enter."

  6. 6

    Choose "Extended Test" from the main menu. The extended test takes an hour or longer to run. You must be present while the test is running to answer any questions the software asks.

  7. 7

    Write down the error code and related message after the test is complete. Follow the troubleshooting steps shown on-screen to repair the Dell Precision 390.

  8. 8

    Close the test window and the main menu to exit from Dell Diagnostics and restart the computer.

Tips and warnings

  • If the troubleshooting steps fail to resolve the problem, contact Dell Support for further assistance.

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