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Do you still have the unknown device in device manager? If so, you need to install a different driver. If not, go into device manager, expand Sound, Video, and Game Controllers. For each device under that heading, right-click the device, then click update driver software, choose "Search Automatically..." It will then go to the windows update site and see if there is a driver there that is listed as more recent, and it will install that driver, if such a driver is found. If that doesn't work, make sur ethat y ou manually find the correct sound driver installer, and then right-click whichever device obviously represents the sound hardware driver, and click Uninstall. Reboot afterward. Then reinstall the audio driver. If that doesn't work, you may have to reinstall windows.
Did you checked the bios setting for your audio? It should be set to Auto. See the Advanced tab in bios, onboard Devices Configuration section 4.4.4 page 4-23 in your manual. On the other hand if you open windows device manager and within Sound, video and game controller you see either unknown PCI device or a yellow pair shaped icon with an ! point in it, than you'll need to install the audio software through windows device manager. Make sure your Asus driver CD is loaded into your CD-Rom drive. Open windows device manager again. Right click once on the unknown PCI device and left click once on update driver. Follow the on screen prompts. Point windows to the CD. You may need to open the driver folder on the CD and click on it once so it is high lighted. Than click OK. The audio driver software should install. If this fails to fix your issue than the onboard audio chip is defective. You can not repair this.
If your MB is still in warranty (Asus 3yr). You can RMA the MB.
Open windows control panel. Open add-remove programs. Uninstall any sound driver software. (Reboot the system when finished). Download RegCure, its free (This will clean your windows registry). Click on the link below; http://www.pctuneuptips.com/recommends/clean/?gclid=CL2RiIrTmpICFSFMGgodODIPzg (Re-start when finished). Check your bios. Once your in the bios, go to the Advanced menu. Open, Onboard Devices Configuration. Check your settings against the manual. See page 2-24. Save & exit the bios. Boot your system. Open windows device manager. Look for a yellow pair shaped icon with an ! point or an ? in it or an unknown PCI device. If you see any, you'll need to install the driver software from here. Right click once on the device, (Like unknown PCI device). From the pop-up window that opens left click on, update driver. Load your Asus CD into your CD-ROM drive. (Follow, Hardware Update Wizard screens). Point windows to the correct sound folder on the CD. Click on the correct folder so its high-lighted, than click OK. Windows will do the rest. When you first got the board the jumper settings for sound are set for AC97. See top of page 1-30. If windows does not detect the sound device while in windows device manager, it is possible the onboard sound chip is defective. Asus warrants their boards for 3 years. You may need to call Asus for an RMA & send the board back. Call Asus tech first at, 812-282-2787 IL EST. M-F 8:00AM-4:00PM Call, 510-739-3777 for RMA Below is the link for your board; http://support.asus.com/download/download.aspx?modelname=P5GC-MX&SLanguage=en-us Good luck! Mike
Check that you are using the correct audio drivers for your PC. Eventually you can buy a PCI sound card, which is quite inexpensive, and install it on the motherboard. It can replace the sound card integrated with the motherboard. once the new card is installed the old card must be set on ' do not use this device (disable)' from device manager.
Sometimes motherboard cd drivers bring multiple sound drivers, you have to make sure you choose the correct one.
Below is the download page for audio driver for Intel D975XBX2 motherboard.
Hope one of these from this page works for you.