Lenovo PC 300PL Using your Personal Computer - PC300PL - 6592 - Page 80
Power-On Self-Test POST
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POST message charts Troubleshooting charts Diagnostic programs Descriptions of these tools follow. Power-On Self-Test (POST) Each time you turn on your computer, it performs a series of tests that check the operation of the base computer. This series of tests is called the power-on self-test (POST). Note If your computer starts up, but does not boot, when you press the power switch, do the following: Make sure all cables are securely connected to the correct locations. Check to see if the voltage-selection switch is set to the correct position for your country. For additional information, see Setting Up Your Personal Computer. POST does the following: Checks basic system-board operations Checks the memory operation Compares the current system configuration with that established by the Configuration/Setup Utility program Starts the video operation Verifies that the diskette drives are working Verifies that the hard disk drive and CD-ROM drive (if installed) are working As POST starts, numbers showing the amount of memory being tested appear in the top-left corner of the screen until the total amount of memory in the system is reached. Also, numbers representing various steps during the startup sequence appear in the top-right corner of the screen (these numbers can be useful to support personnel if a "hang" condition occurs during POST). Options for running a fast POST or accessing the Configuration/Setup Utility program appear in the lower-left corner of the screen. 66 Using Your Personal Computer