Troubleshooting
Dell SupportAssist Pre-boot System Performance
Check diagnostics
About this task
SupportAssist diagnostics (also known as system diagnostics) performs a complete check of your hardware. The Dell
SupportAssist Pre-boot System Performance Check diagnostics is embedded with the BIOS and launched by the BIOS
internally. The embedded system diagnostics provides options for particular devices or device groups allowing you to:
● Run tests automatically or in an interactive mode.
● Repeat the tests.
● Display or save test results.
● Run thorough tests to introduce additional test options to provide extra information about one or more failed devices.
● View status messages that inform you the tests are completed successfully.
● View error messages that inform you of problems encountered during testing.
NOTE:
Some tests for specific devices require user interaction. Always ensure that you are present at the computer
terminal when the diagnostic tests are performed.
For more information, see the knowledge base article 000180971.
Running the SupportAssist Pre-Boot System Performance Check
Steps
1. Turn on your computer.
2. As the computer boots, press the F12 key as the Dell logo appears.
3. On the boot menu screen, select the Diagnostics option.
4. Click the arrow at the bottom left corner.
Diagnostics front page is displayed.
5. Click the arrow in the lower-right corner to go to the page listing.
The items that are detected are listed.
6. To run a diagnostic test on a specific device, press Esc and click Yes to stop the diagnostic test.
7. Select the device from the left pane and click Run Tests.
8. If there are any issues, error codes are displayed.
Note the error code and validation number and contact Dell.
Power-Supply Unit Built-in Self-Test
Built-in Self-Test (BIST) helps determine if the power-supply unit is working. To run self-test diagnostics on the power-supply
unit of a desktop or all-in-one computer, search in the Knowledge Base Resource at www.dell.com/support.
System-diagnostic lights
This section lists the system-diagnostic lights of your OptiPlex Tower Plus 7020.
Diagnostic light
The power and battery status light indicates the power and battery status of the computer. These are the power states:
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