CAUTION: To guard against the likelihood of electric shock, laceration by moving fan blades, or other expected injuries, always unplug your computer from the electrical outlet before opening the cover.

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.

Beep Codes:

Your computer might emit a series of beeps during start-up if the monitor cannot display errors or problems. This series of beeps, called a beep code, identifies a problem. One possible beep code consists of repetitive three short beeps. This beep code tells you that the computer encountered a possible motherboard failure. If your computer beeps during start-up:

1. Write down the beep code.
2. Run the De™ Diagnostics to identify a more serious cause (see "De Diagnostics" on page 42).

Error Messages:

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer. If the message is not listed, see the documentation for the operating system or the program that was running when the message appeared.

AUXILIARY DEVICE FAILURE — The touch pad or external mouse may be faulty. For an external mouse, check the cable connection. Enable the Pointing Device option in the system setup program. See your Service Manual at support.de.com for more information. If the problem persists, contact De (see "Contacting De" on page 65).

BAD COMMAND OR FILE NAME — Ensure that you have spelled the command correctly, put spaces in the proper place, and used the correct pathname.

CACHE DISABLED DUE TO FAILURE — The primary cache internal to the microprocessor has failed. Contact De (see "Contacting De" on page 65).