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Chrome OS Post Boot Diagnostics

Summary: General information about the Chrome OS diagnostics tool.

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Article Content


No symptoms information.


No cause information.


Table of Contents:

  1. Overview
  2. How to Access the Diagnostics Tool
  3. Running the Diagnostics and Test Results


The new Chrome OS diagnostics tool can be used to investigate the battery, processor, and memory status of a Chromebook in real time.

You can run troubleshooting test routines, where results and telemetric information can be saved in a session log file. This can be used to assist with the following:

  • Streamline the troubleshooting process.
  • Easier knowledge transfer and sharing of results.
  • Enable Support Agents to identify the best cost-effective fix and to validate a solution.

When should the Diagnostics tool be used?

  • The Chromebook battery is draining fast.
  • The Chromebook is running slow.
  • The Chromebook is having memory problems.

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How to Access the Diagnostics Tool

You can use the following two methods to access the diagnostics tool.

With the Launcher

  1. At the bottom left of the screen, select the Launcher (Figure 1).
    Chrome OS Launcher
    Figure 1
  2. Locate the Omnibox (Figure 2).
    Chrome OS Omnibox
    Figure 2
  3. Type Diagnostics in the Omnibox to locate the tool (Figure 3).
    Chrome OS Search
    Figure 3

With the Settings

  1. At the bottom right of the screen, select the Status Tray (Figure 4).
    Chrome OS Status Tray
    Figure 4
  2. Select Settings (Figure 5).
    Chrome OS Settings
    Figure 5
  3. Select Search (magnifying glass) (Figure 6).
    Chrome OS Search
    Figure 6
  4. Type Diagnostics into the Settings search bar. Select Diagnostics in the search results (or press the Enter button) (Figure 7).
    Chrome OS Search
    Figure 7
  5. Under About Chrome OS, locate and select Diagnostics to open the App (Figure 8).
    Chrome OS Search Results
    Figure 8
  6. Select the diagnostic you would like to run (Figure 9).
    Chrome OS Diagnostics Tool
    Figure 9
Note: Running the processor tests can stress the Chromebook to the point where normal use may be difficult.
Typical run times for tests.
  • Battery 10-15 minutes.
  • Processor 10-15 minutes.
  • Memory 10-40 minutes.

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Running the Diagnostics and Test Results

Use the following steps to run the diagnostics and save the test results.

Note: Only one test can be run at a time. The steps below are for the battery test, but is used as an example.
  1. Select Run Charge Test (Figure 10).
    Assess discharge rate.
    *The Chromebook should be unplugged from AC power for the battery test.
    Chrome OS Diagnostic Test
    Figure 10
  2. If a test fails in any of the three testing routines, you may investigate more from the Help Center External Link (Figure 11).
    Chrome OS Battery Diagnostic Test
    Figure 11
  3. A faster way to investigate why certain tests have failed is clicking “Why has this test failed?” (Figure 12)
    Chrome OS Battery Diagnostic Test Results
    Figure 12
  4. If a test fails, session logs will be saved by clicking Save session log (at the bottom of the Diagnostics tool) (Figure 13).
    Chrome OS Diagnostic Tool Save Session Log
    Figure 13
  5. You can download the .txt file and share it using chat support, email, or verbally on the phone (Figure 14).
    Chrome OS Save File As
    Figure 14

Diagnostic logs are only available on Chrome OS devices running version 90 and above. Learn More About Updating a Chromebook's Operating System External Link

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Article Properties

Affected Product

Chromebook, Chromebook, Chromebook

Last Published Date

14 May 2021



Article Type