SupportAssist diagnostics
About this task
The SupportAssist diagnostics (previously known as ePSA diagnostics) performs a complete check of your hardware. The
SupportAssist diagnostics is embedded in the BIOS and is launched by it internally. The SupportAssist diagnostics provides a set
of options for particular devices or device groups. It allows you to:
● Run tests automatically or in an interactive mode.
● Repeat tests
● Display or save test results
● Run thorough tests to introduce additional test options and provide extra information about the failed device(s)
● View status messages that indicate if the tests are completed successfully
● View error messages that indicate if problems were encountered during the test
NOTE: Some tests are meant for specific devices and require user interaction. Ensure that you are present in front of the
computer when the diagnostic tests are performed.
For more information, see SupportAssist Pre-Boot System Performance Check.
Built-in self-test (BIST)
M-BIST
About this task
The M-BIST (Built-In Self-Test) diagnostics tool allows users to diagnose system-board failures.
NOTE: M-BIST can be manually-initiated before POST (Power-On Self-Test).
How to run M-BIST?
M-BIST must be initiated from a power-off state with the computer either connected to the supplied AC power adapter or
running on a fully-charged battery.
Steps
1. From the power-off state, press and hold both the M key on the keyboard and the power button to initiate M-BIST.
2. With both the M key and the power button held down, the battery indicator LEDs exhibit two states:
a. OFF: No fault is detected with the system board.
b. AMBER: Indicates a problem with the system board.
LCD Built-In Self-Test (BIST)
About this task
LCD BIST is a diagnostic tool that helps you determine if a screen abnormality is an inherent problem with the LCD screen of the
computer, with the video card or with the computer's settings.
It is recommended to run BIST to isolate the cause of a screen abnormality if you encounter display issues such as:
● flickering
● distortion
● clarity issues
● fuzzy or blurry image
● horizontal or vertical lines
● color fading
Starting the LCD BIST test
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Troubleshooting
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