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 HP OmniBook 900 Troubleshooting and Diagnostics 3-5 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 1-14. Startup Does not boot on ac or battery Check the power source. Push system-off button. Unplug the ac adapter and remove battery, then reconnect power. Remove any RAM board and try again. Reinsert and try again.
AC adapter. RAM board. CPU module. Motherboard. BIOS IC. LCD module. Hard drive. Check ac adapter. Remove any RAM boards and retry. If power status light does not turn on, reprogram or replace BIOS IC, 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 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. Does not boot on battery (boots on ac) Check battery level on battery LEDs. Check battery contacts. If available, try another battery. Battery or contacts. Motherboard. Does not boot from floppy drive Check floppy drive contacts. Try reseating the external module bay cable and the module into the bay. Try using alternate connection (with accessory floppy cable or external module bay). Check boot order in BIOS Setup. Check that floppy boot is enabled in BIOS Setup. Floppy drive or contacts. Accessory floppy cable. External module bay. Motherboard.
Error message such as “Invalid system disk” or “Auto IDE error” Check for a disk in floppy drive. Remove and reinsert hard drive. Check boot order in BIOS Setup. Hard drive contacts. Hard drive. If unit boots from floppy drive, check for corrupt files on hard drive, reload hard drive, replace hard drive.