Acer Altos R510, Руководство по обслуживанию, Страница: 106 / 143

99 Chapter 4
Hardware Diagnostic Testing
This section provides a more detailed approach to identifying a hardware problem and locating its source.
CAUTION: Turn off devices before disconnecting cables:
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
devices.
1. Turn off the system and all external peripheral devices. Disconnect each device from the system, except
for the keyboard and the video monitor.
2. Make sure the system power cord is 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 (see
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
and no CD-ROM disk in the CD-ROM drive.
5. If the power LED does light, attempt to boot from a floppy diskette or from a CD-ROM disk.
6. Turn on the system. If the power LED does not light, see "Power Light Does Not Light."
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 for the following:
T
Does the diskette drive activity light turn on briefly? If not, see "Diskette Drive Activity Light Does
Not Light."
T
If system LEDs are illuminated, see "LED Information" for a description of the light and steps to
take to correct the problem.
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 "No Characters Appear on
Screen"