the diagnostic tests can provide you with important information you will need when talking to Dell's service and support personnel.

NOTICE: Use the Dell Diagnostics to test only your Dell computer system. Using this program with other computers may cause incorrect computer responses or result in error messages.

The Dell Diagnostics provides a series of menus and options from which you choose particular test groups or subtests. You can also control the sequence in which the tests are run. The diagnostic test groups or subtests also have these helpful features:

Options that let you run tests individually or collectively

An option that allows you to choose the number of times a test group or subtest is repeated

The ability to display or print out test results or to save them in a file

Options to temporarily suspend testing if an error is detected or to terminate testing when an adjustable error limit is reached

A Devices menu category that briefly describes each test and its parameters

A Config menu category that describes the configuration of the devices in the selected device group

Status messages that inform you whether test groups or subtests were com- pleted successfully

Error messages that appear if any problems are detected

As long as the microprocessor and the input and output components of your com- puter system (the monitor, keyboard, optical drive, and diskette drive) are working, you can use the Dell Diagnostics. If you are experienced with computers and know what component(s) you need to test, simply select the appropriate diagnostic test group(s) or subtest(s). If you are unsure about how to begin diagnosing a problem, read the rest of this section.

Starting the Dell Diagnostics

To start the diagnostics, perform the following steps:

1.Turn on (or restart) your system.

2.Enter the system setup program by pressing <Del> when the blue Dell logo appears.

If you wait too long and the operating system begins to load into memory, let the system complete the load operation. Then shut down the system and try again.

See Appendix B, “System Setup Program,” for more information.

3-10 Dell Dimension 900 System Reference and Troubleshooting Guide

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Dell 900 manual Starting the Dell Diagnostics