119
Hardware diagnostic testing
This section provides a more detailed approach to identifying a
hardware problem and its source.
Checking the boot-up status
Caution: 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 device.
1 Turn off the system and all external peripheral devices.
2 Disconnect each device from the system, except for the keyboard
and the display monitor.
3 Make sure the system power cord is plugged into a properly
grounded AC outlet and in the power supply module cord socket.
4 Make sure the display monitor and keyboard are correctly
connected to the system.
5 Turn on the display monitor.
6 Set the display brightness and contrast controls to at least two
thirds of their maximum range.
Refer to the documentation that came with your display monitor.
7 If the operating system normally loads from the hard drive, make
sure there is no diskette in floppy drive and no disc in the optical
drive.
8 If the power indicator is lit, attempt to boot from a floppy diskette
or from a disc.
9 Turn on the system.
If the power indicator on the control panel does not light, see
“Power indicator does not light” on page 121.
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