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Problem Solving 5-5
Additional Troubleshooting Procedures
This section provides a more detailed approach to diagnostic testing and
identification of a problem and locating its source.
Error Checking
Each time you turn on the system, POST runs automatically and checks the
system boards, processors, memory, keyboard, and most installed peripheral
devices.
If POST finds an error, it displays an error message. Refer to the Error Message
section in this chapter for an explanation of each error message.
Troubleshooting Guide
Use the following troubleshooting procedures to help you identify a problem.
These general procedures lead you through the following:
preparing the system for diagnostic testing
monitoring POST while it is running
verifying proper operation of key system LEDs
confirming loading of the operating system.
Preparing the System for Diagnostic Testing
To prepare the system for diagnostic testing, perform the following:
Note:
Before disconnecting any peripheral cables from
the system, turn off the system and any external peripheral
devices. Failure to do so can cause permanent damage to
the system and/or the peripheral devices.
1. Turn off the system and all external peripheral devices. Disconnect all
devices from the system except the keyboard and video monitor.
2. Make sure the system power cords are plugged into a properly grounded AC
outlet.
3. Make sure your video display monitor and keyboard are correctly connected
to the system. Turn on the video monitor. Set its brightness and contrast
controls to at least two-thirds of their maximum ranges (refer to the
documentation supplied with your video display monitor).
4. If the operating system normally loads from the hard disk drive, make sure
there is no diskette in drive A. Otherwise, place a diskette containing the
operating system files in drive A.
5. Turn on the system. If the power indicator LED does not light, refer to
Power Light Does Not Light found later in this chapter.