IBM 704 User Manual download pdf (Page 233)

Overview of the Diagnostic Tools

Power-On Self-Test (POST)

Each time you turn on the system, it performs a series of tests that

check the operation of the system and some options. This series of

tests is called the power-on self-test, or POST. POST does the

following:

 Checks some basic system-board operations

 Checks the memory operation

 Starts the video operation peripherals are working

 Detects and initializes ISA devices

 Detects and configures EISA devices

 Detects and configures PCI devices

 Verifies that the diskette drive, hard disk drive, and other

installed devices are working

Check the indicator lights on the front of the server and the back of

the power supplies. Verify that all of the amber LEDs are off. If an

amber LED is on, see “Identifying Problems through Status

Indicators” on page 258. Verify that all server devices are operating

properly. If a device is not operating properly, ensure that it is not

defective and is installed correctly. Replace defective devices and

reinstall any device that is not installed correctly.

If POST finishes without detecting any problems, a single beep

sounds and the first screen of your operating system or application

program appears. If no operating system is installed, the system

prompts you to insert a startable diskette. Insert a diskette, and

install an operating system. Follow the directions in your

operating-system documentation and on the screen. Also see

Chapter 2, “Installing Your Software” on page 27.

If POST detects a problem, an error message appears on your

screen. A single problem can cause several error messages to

appear. When you correct the cause of the first error message, the

other error messages probably will not appear on the screen the

next time you turn on the system.

Chapter 5. Solving Problems 215

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IBM 704 User Manual Page 233