IBM 865511Y Hardware Maintenance Manual - Page 16

Diagnostics Computer problems can be caused by hardware, software, or user error (for example, pressing the wrong key). The following tools are available to help identify and resolve hardware-related problems. Power-on self test (POST) Each time you turn on your computer, a series of tests that check the basic operation of the computer are performed. This series of tests is called POST. Note If your computer does not start when you press the power switch, do the following: Make sure all cables are securely connected to the correct locations. Make sure the computer cover is installed properly (pushed all the way on). If this does not correct the problem, go to "General Checkout" on page 5. 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 the CD-ROM drive are working If Power On Self Test is set to [Enhanced], 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. Quick mode is the default mode of operation. Options for running a quick POST or accessing the Configuration/Setup Utility program appear in the lower-left corner of the screen. Note The amount of available memory shown might be somewhat less than expected because of basic input/output system (BIOS) shadowing in random access memory (RAM). If POST finishes without detecting any problems, the first screen of your operating system or application program appears (if you have not set a power-on password). If you have set a power-on password, a password prompt appears. You must enter your password before the first 8 Netfinity Server HMM