Power-On Self Test; Power-On Self Test (Post) - IBM 5155 Manual To Operations

Power-On Self Test (POST)
The power-on self test (POST) will run after you set
the Power switch on the system unit to On. The POST
will take 23 to 90 seconds, depending on the amount of
memory installed in your system.
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Turn the display's Contrast and Brightness
controls fully clockwise. After the first screen is
displayed adjust the controls for eye comfort.
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Set the Power switch on the system unit to On.
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1-16 Introduction