Check if Your AC Power Supply is Properly Connected ![]() Before you run a test, you might need to fully charge the device to 99 or 100 percent, disconnect the AC adapter, boot into the diagnostic utility, and then run the test. Accessing the diagnostics will vary by manufacturer, so consult the documentation that came with your computer. It is recommended you also use those to test your battery. Most laptop computers include their own factory diagnostics utilities, too.
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