Table 3-2. Troubleshooting Suggestions - HP DesignJet 500 Service Manual

If you cannot isolate the cause of a problem using the above diagnostic tools, use the suggestions in
the following table to help find the problem.
Symptom Call Center:
Suggestions
To help determine likely causes, find out which replaceable components are involved in the system involved,
and what roles they play. See Figure 1-11 on page 1-19 and Table 1-9 on page 1-20.
Startup
Does not boot on Check the power source.
AC or battery.
Press the system-off switch
to reset the computer.
Unplug the AC adapter and
remove all batteries, then
reconnect power.
Remove any SDRAM
expansion module and try
again.
Beeps once, spins
hard disk, repeats,
but does not boot.
Does not boot on Check the battery level using
main battery, but the battery LEDs.
boots on AC.
Check battery contacts. If
available, try another battery.
3-6 Troubleshooting and Diagnostics

Table 3-2. Troubleshooting Suggestions

Repair Center:
Likely Causes
AC adapter.
SDRAM module.
Motherboard.
Display assembly.
Hard drive.
SDRAM module.
Battery or contacts.
Motherboard.
Repair Center:
Comments
Check the AC adapter.
Remove any SDRAM
expansion module and try
again.
Replace the system SDRAM
module.
If the power mode light does
not turn on, reprogram the
BIOS; replace the
motherboard.
If the power mode light turns
on but the display does not,
try an external monitor. If the
monitor shows a successful
boot, replace the display
assembly. If the monitor
shows activity but the BIOS
does not complete, replace
the display assembly. If the
monitor is blank, replace the
motherboard.
If the power mode light and
display turn on and the BIOS
completes, but the OS will
not start from the hard disk or
from a floppy drive, replace
the motherboard. If the OS
starts only from a floppy
drive, reinstall the factory
software onto the hard drive;
replace the hard drive.
Make sure at least one
SDRAM module is installed.
HP Omnibook 500