If you can’t isolate the cause of a problem using the diagnostic tools, you can use the suggestions in the following table to help find the problem.

Table 3-2. Troubleshooting Suggestions

 

Symptom

 

Call Center:

 

Repair Center:

 

Repair Center:

 

 

 

 

Suggestions

 

Likely Causes

 

Comments

 

 

 

 

 

 

 

 

 

 

To help determine likely causes, check to see what replaceable modules are involved in the system function and what roles they play. See the table on page 1-15.

Startup

Does not boot on ac or battery

OmniBook 4150 Series model beeps once, spins hard disk, repeats, but does not boot

Does not boot on battery (boots on ac)

Check the power source. Push system-off button.

Unplug the ac adapter and remove all batteries, then reconnect power.

Remove any RAM board and try again. Reinsert and try again.

Check battery level on battery LEDs.

Check battery contacts. If available, try another battery.

AC adapter.

DC-DC PCA.

RAM board.

CPU module.

Motherboard.

VGA PCA.

LCD module.

Hard drive.

RAM board (OB 4150 Series).

Battery or contacts. DC-DC PCA. Motherboard.

For an OmniBook 4100 with serial number below TW84099999, check CPU bottom plate. If plate is less than “Rev 4”, replace bottom plate. Also, make sure a square spacer is installed on top of the CPU top plate at the right-rear corner. (Service note 4100-03C.)

Check ac adapter. Remove any RAM boards and retry.

If power status light does not turn on, reprogram BIOS, replace DC-DC PCA, replace motherboard.

If power status light turns on but display remains off, try external monitor. If monitor shows successful boot, replace LCD module. If monitor shows activity but BIOS does not complete, replace CPU module. If monitor is blank, replace VGA PCA, replace CPU module, replace motherboard.

If power status light and display turn on, BIOS completes, but OS does not start from hard disk or from floppy drive, replace CPU module, then motherboard. If OS starts from floppy drive, reload hard drive, replace hard drive.

Make sure at least one RAM board is installed.

HP OmniBook 4100/4150

Troubleshooting and Diagnostics

3-5