Why has my graphics card disabled my on-board sound card?

Why has my graphics card disabled my on-board sound card? Installed a Palit GeForce GT 240 (512mb GDDR3) graphics card last night and visually its working well, but it seems to have installed its own HD Audio device(s) in Device Manager, knocking out my normal on-board sound (motherboard sound connectors), resulting in Win 7 telling me I have no audio output device installed.
Asked by: Guest \| Views: 304

Total answers/comments: 2

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Guest [Entry]

"Solved it! Flash of inspiration made me reboot and check the BIOS settings. The Onboard Audio has three options (Auto, Enabled and Disabled). Was set to Auto, changed it to Enabled and all was detected.

I suspected Auto means ""use it if you can't find another sound device plugged in"""

Guest [Entry]

You need to check your BIOS and make sure integrated audio is set to enabled. It usually doesn't cause issues when you install the graphics card, but for some reason on some it does. We just did a whole bunch of refurb computers for a client (20 computers) and all of them had an issue with the sound not working. After digging around on the computer BIOS seen this option, tried it and it works now.