HP OmniBook 900 Troubleshooting and Diagnostics 3-9 Symptom Call Center: Repair Center: Repair Center: Suggestions Likely Causes Comments Audio Sound does not play Check settings in BIOS Setup. Increase sound volume (Fn+UP and software controls). Check whether mute is active (Fn+F7 and software controls). Check for sound resource conflicts in Device Manager (Windows 95/98) or Administrative Tools or Control Panel System (Windows NT). Speaker. Motherboard. Check operation using headphones or external speakers. Sound does not record Check settings in BIOS Setup. Check software controls for microphone—it should not be muted in recording panel. Note:
The microphone should normally be muted in the master output panel. Top case (microphone). Motherboard. Check operation using external microphone. Serial/Parallel General problems Check settings in BIOS Setup. Check settings in Control Panel (and in Windows NT Diagnostics). Motherboard. Use loopback connector during test—see page 3-14. Infrared General problems Infrared communication is not supported in Windows NT 4.0. Infrared is disabled when shipped. Drivers are included but not installed when shipped. Check settings in BIOS Setup. Standard IrDA and fast-IrDA are incompatible (they use different drivers). For fast-IrDA, check for DMA conflict with ECP parallel port. Motherboard.
USB General problems USB is not supported in Windows NT 4.0. Motherboard.