HP OmniBook 900 Troubleshooting and Diagnostics 3-7 Symptom Call Center: Repair Center: Repair Center: Suggestions Likely Causes Comments White display Adjust display brightness. LCD module. Motherboard. Erratic display LCD flex cable or connections. LCD module. Make sure the LCD module and flex cable have small foam pads attached—see page 2-10. Bright or missing pixels or lines See quality statement on page 5-2. LCD module. LCD flex cable or connections. See quality statement on page 5-2. Hard disk Hard disk never spins Check the power source. Remove and reinsert the hard drive. Check the contacts. Hard drive or contacts. Motherboard.
Hard disk makes clunking or scratching noise Back up the drive immediately. Was the computer or drive dropped? Hard drive. Check the computer and drive for evidence of customer abuse. Hard disk makes buzzing or whining noise Back up the drive immediately. Check for alternate noise sources, such as a PCMCIA drive or fan. If a keystroke causes the sound to change, it may be power supply noise. Depends on the source of the noise. For a serial number before TW92500000, remove the drive and check whether the slot has a metal bracket across the inside top of the slot. If there is no bracket, you should install a HDD bracket and required case parts.
(Service note 900-14.) Files are corrupted Run a virus scan program. Check the disk surface by running Scandisk (Windows 95/98) or Disk Administrator (Windows NT). Or boot to DOS and run CHKDSK to look for problems, run CHKDSK /f to fix. Use Recovery CD to restore original factory software. Use same suggestions shown at left. Drive capacity is less than normal Check the disk surface by running Scandisk (Windows 95/98) or Disk Administrator (Windows NT). Check partitions using FDISK (Windows 95/98) or Disk Administrator (Windows NT). Hard drive. Use same suggestions shown at left. Recreate the Hibernate partition (see page 2-8), then partition and format the disk.
Floppy drive General problems 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 settings in BIOS Setup. Floppy drive or contacts. Accessory floppy cable. External module bay. Motherboard.