Note, when you get to step c, before you install the Sigmatel driver go to your Device Manager and look for an unknown PCI device. When you get on the page use the dropdown box to select your Operating System. Get these from the Vostro l400 driver downloads page. Install the other drivers including the Sigmatel audio driver (expand the Audio category). Next install the Intel Mobile Chipset driver (expand the Chipset category). Dell Notebook System Software (on your downloads page expand the System Utilities category). If that doesn't work then a full re-installation may be necessary.Īfter you have performed an Operating System re-installation, install in this order:Ī. In this situation "usually" a fresh install of the OS is not required, just re-installing the NSS and chipset correctly. usually you get an error message, because the Notebook System Software and chipset drivers were not installed correctly and the audio chip on the motherboard is not recognized. These instructions are for a situation where an operating system has already been reinstalled and everything works except the audio driver will not install.
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