Microsoft KB Archive/318720

= You Do Not Receive a Dial Tone If You Use an HP Rockwell HCF 56k Data/Fax Modem =

Article ID: 318720

Article Last Modified on 10/30/2006

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q318720



SYMPTOMS
If you try to use the HP Rockwell HCF 56k modem, you do not receive a dial tone. This behavior can also occur after you download the most recent drivers for this modem.



CAUSE
This issue occurs because this modem is not compatible with Advanced Configuration and Power Interface (ACPI) because of an interrupt request (IRQ) conflict. Windows 2000 supports ACPI-compliant BIOS versions.



RESOLUTION
To work around this issue, turn off the ACPI functionality in the computer BIOS.

NOTE: If you change the ACPI state in the BIOS, you may not be able to start the computer. Some computer manufactures do not allow you to modify the ACPI state in the BIOS.



MORE INFORMATION
This modem is hard wired for IRQ 9 and cannot be moved to another IRQ. IRQ 9 is used for ACPI. For additional information about how to troubleshoot ACPI issues in Windows 2000, click the article number below to view the article in the Microsoft Knowledge Base:

237556 Troubleshooting Windows 2000 Hardware Abstraction Layer Issues

252420 General Description of IRQ Sharing in Windows 2000

244806 Overview of Power Management in Windows 2000

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbprb KB318720

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