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More Problem Solving Procedures
This section provides a more detailed approach to identifying a problem and locating its source.
Preparing the System for Diagnostic Testing
CAUTION
Turn off devices before disconnecting cables: 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.
Check the following:
Turn off the system and all external peripheral devices. Disconnect all of them from the system,
except the keyboard and video monitor.
Make sure the system power cord is plugged into a properly grounded AC outlet.
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 (see the documentation supplied with your video display monitor).
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.
Turn on the system. If the power LED does not light, see "Power Light Does Not Light" on
page 63.
If errors are encountered, power off the system and remove all add-in cards.
Monitoring POST
See "Power-On Self-Test (POST)," on page 34.
Verifying Proper Operation of Key System Lights
As POST determines the system configuration, it tests for the presence of each mass storage device
installed in the system. As each device is checked, its activity light should turn on briefly. Check
the following:
Does the diskette drive activity light turn on briefly? If not, see "Diskette Drive Activity Light Does
Not Light" on page 64.
If a second diskette drive is installed, does its activity light turn on briefly? If not, see "Diskette
Drive Activity Light Does Not Light" on page 64.
Confirming Loading of the Operating System
Once the system boots up, the operating system prompt appears on the screen. The prompt varies
according to the operating system. If the operating system prompt does not appear, see "Initial
System Setup" on page 60.
xSeries 343 Product Guide
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