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HP Compaq dc7900 Business PC - No Sound from Built-In ADI SoundMax Audio Controller After Installing ATI Radeon HD 3650 PCIe Graphics Adapter with Microsoft Windows XP

Issue
Once the ATI Radeon HD 3650 512-MB DH PCIe x16 Graphics Card is installed, there is no audio in Microsoft Windows XP using the built-in sound controller.
If the ATI Radeon HD 3650 512-MB DH PCIe x16 Graphics Card is removed and the built-in graphics controller is used, audio works correctly.
Solution
This issue can occur due to an IRQ conflict with the ATI HD device. The default IRQ set for this device in BIOS is IRQ 10.
If you disable the IRQ for the ATI HD device, the ADI SoundMax Controller will work with the ATI Radeon HD 3650 512-MB DH PCIe x16 Graphics Card installed.
When the IRQ for the ATI HD Audio device is disabled, it will not be able to interrupt the processor, but it will free up IRQ resources for other devices.
To disable the ATI HD Audio IRQ, complete the following instructions:
  1. Start the HP Compaq dc7900 PC with the new ATI Radeon HD 3650 512-MB DH PCIe x16 Graphics Card installed, and access the BIOS menu by pressing the F10 key at the HP Logo screen.
  2. From the BIOS main screen, navigate to Advanced -> PCI devices.
  3. At the PCI devices list, locate the ATI HD Audio Device entry and change the IRQ to Disable, and then apply the BIOS changes by pressing the F10 key.
  4. Navigate to the File menu and choose the Save Change and Exit option.
    Once you restart the system, the ADI SoundMax Controller will be active with audio output.

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