T430 NVidia GPU not listed in device manager

Hello -- I have a problem regarding the NVidia NVS 5400M inside the Thinkpad T430. I use Windows 8. I'm not exactly sure how it happened, but the NVidia card no longer shows up in Device Manager and the NVidia driver (both the standard driver from their website AND Lenovo's Optimus driver) refuses to install, complaining it can't find any compatible hardware. Device Manager does not list any graphics cards or unknown devices, and as far as Windows is concerned the NVidia card does not exist.
Here's a summary of what I see:
In Discrete Graphics mode -- my Linux installation (which uses native NVidia drivers) works fine and uses the NVidia card. Windows 8 boots and runs with a generic graphics driver; there is a performance hit, and no graphics cards or unknown devices are listed in Device Manager. That's the problem I want to fix.
In Optimus mode -- Windows 8 boots and runs with the Intel integrated graphics (Intel HD Graphics 4000) which is listed in Device Manager. Again, no other graphics cards or unknown devices are listed.
I appreciate in advance any help towards getting the NVidia drivers installed successfully!
Solved!
Go to Solution.

nsrathjen wrote:
Yep, still doesn't appear that the NVidia drivers from that package are installing. If I boot in Optimus mode, only the Intel card is shown in Device Manager. I'd like to not have to use Optimus and just stay in Discrete Graphics mode if possible because Linux support for Optimus is not very good.
Would completely uninstalling all the drivers possibly help?
Before you go through that hassle, try the following:
1. Go into the BIOS Configuration Display setting and change it to Discrete only. If you see a setting just below display that talks about OS detection, disable that as well otherwise it will try to flip back to Optimus. F10 to save and exit.
2. Go back into the BIOS settings and verify the setting was really saved. Exit the BIOS settings (discarding this time) and boot Windows normally.
3. Go to C:\DRIVERS\WIN\VIDEO\NVIDIA and run setup.exe. Use the Custom option for the mode after it does compat checks and asks for you to agree to the EULA.
4. When you see the list of custom installation options, turn on the "Perform a clean installation" checkbox. This should not present a problem if you don't have custom profiles.
See if that works.

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