This is the process NVIDIA chat support and I took to get my video card back in operational status. Hope you find it helpful.
Mohemed Arshad: Hi, my name is Mohemed Arshad. How may I help you?
Zach Oxley: Hi Mohemed. I recently purchased the GeForce 8400 GS for my HP Pavilion S3220N. After installation, all was fine, drivers loaded and was able to run HDMI from my tv. After attempting to update the driver, I am unable to use either DVI or the HDMI on the graphics card. I removed the VGA port to make it low profile. Can you help?
Mohemed Arshad: I apologize for the inconvenience this has caused, did you remove the previous drivers before installing the new ones?
Zach Oxley: Yes I did. I removed any trace of NVIDIA from my machine (even down in the registry and then attempted to reinstall. Will not work.
Mohemed Arshad: which operating system are you using?
Zach Oxley: Windows 7 Home Premium
Mohemed Arshad: Please give me two to three minutes, let me check for similar issues.
Zach Oxley: Thank you Mohemed
Zach Oxley: the OS is 32-bit, if that makes a difference in your search
Mohemed Arshad: Thank you for your patience.
Zach Oxley: Of course.
Mohemed Arshad: I am sorry, I am not able to find any similar issues.
Have you tried restarting the computer with only one display connected?
Zach Oxley: That's the thing, the computer only has one monitor connected to it. I can see graphics from the stock VGA port, but not from either the DVI or HDMI ports. I just restarted the machine with only the DVI port plugged in and I see nothing on the monitor
Zach Oxley: The only way I can view my desktop is through the stock VGA port that came with the computer
Mohemed Arshad: ok, are you using the same computer to chat with me?
Zach Oxley: No I am not.
Mohemed Arshad: That's good, can you check what is listed under Display Adapters in the Device Manager?
Zach Oxley: NVIDIA GeForce 6150SE nForce 430 (Microsoft Corporation - WDDM)
Zach Oxley: NVIDIA GeForce 8400GS
Mohemed Arshad: So you see both listed there right?
Zach Oxley: Yes. But I get no response from the video card when plugged in. Even if I plug up a second monitor and try to extend the desktop, it won't let me.
Mohemed Arshad: Right click on GeForce 6150SE and choose uninstall. Once it completes the uninstallation it will prompt you to restart the computer, but instead shutdown the computer and then plug in the display to the GeForce 8400GS, then start your computer.
Zach Oxley: I can't see my desktop after uninstalling 6150. I can only assume that it is done uninstalling. Should I force shut down the computer?
Mohemed Arshad: Yes, Zach
Mohemed Arshad: Note that the motherboard will enable only one video device at a time, either the onboard or the addon card. Once you unplug the monitor from the onboard and connect it to the addon card, the motherboard will force enable the card and it will give out display. (Even when there are no drivers installed)
Zach Oxley: no response from the video card. I only have DVI plugged in
Mohemed Arshad: Strange, the OS should auto detect a video device in your computer.
Is it possible to reseat the video card?
Zach Oxley: yes, let me open up the computer.
Mohemed Arshad: Sure
Zach Oxley: one second. IT helpdesk stuff
Mohemed Arshad: No problem, take your time.
Zach Oxley: Okay, sorry. Should I boot with only DVI again?
Mohemed Arshad: Yes, Zach
Zach Oxley: still not getting a response.
Mohemed Arshad: Strange.
Zach Oxley: Video card and PCI-E bay look fine.
Zach Oxley: Is there something in the BIOS that I should check?
Mohemed Arshad: Can you try to disable the onboard graphic adapter in the BIOS, so that the motherboard force enables the 8400GS on next restart.
Zach Oxley: BRILLIANT. It seems that it is a BIOS issue. While i have you here, let me try to update my graphics card.
Mohemed Arshad: Sure, Zach
Zach Oxley: Okay, wait... I saw the boot screen, but as soon as it got to the part where it was supposed to boot windows, the screen went black.
Mohemed Arshad: okay, can you check if you are able to get into safemode now?
Zach Oxley: safemode with networking?
Zach Oxley: loading safe mode.
Mohemed Arshad: Just safemode
Mohemed Arshad: and then you can perform a system restore or you can uninstall the current GeForce drivers.
Zach Oxley: Okay, I'm in safemode.
Mohemed Arshad: you can try performing a system restore or you can uninstall the current GeForce drivers from the Device Manager
Zach Oxley: I do not see a "display adapters" section in the device manager
Zach Oxley: I see "display", which has the yellow exclamation mark next to it.
Mohemed Arshad: Let me know what is the error code you get once you choose properties
Zach Oxley: code 28, drivers aren't installed for device
Zach Oxley: shall I try to update the driver?
Mohemed Arshad: Yes, Zach.
Before that let me know what is the current driver version?
Zach Oxley: It does not give me a driver version
Mohemed Arshad: okay, then it must be running in Generic drivers.
Mohemed Arshad: Go ahead and update the drivers.
Zach Oxley: Now I am running generic MS driver version 6.1.7600.16385
Zach Oxley: shall I try a reboot?
Mohemed Arshad: Yes
Zach Oxley: Okay, I am in without Safe mode.
Mohemed Arshad: So this time you were able to boot the computer normally.
Zach Oxley: Yes I was. But everything is huge on the screen, so I assume there is still work to be done.
Mohemed Arshad: Yes, Zach.
Check if you get a pop-up in the task saying a new hardware found or go to device manager and check if this card is listed in the Device Manager.
Zach Oxley: I no longer see NVIDIA GeForce 8400 GS. Let me try to check for new hardware in device man.
Zach Oxley: Nothing.
Zach Oxley: I'm also unable to view Aero effects in Win 7 now.
Mohemed Arshad: Okay, can you download this driver and check if you are able to install it successfully.
http://www.nvidia.com/object/win8-win7-winvista-32bit-310.90-whql-driver.html
Zach Oxley: Downloading.
Mohemed Arshad: okay
Zach Oxley: still with me?
Zach Oxley: Express or custom install?
Mohemed Arshad: Yes, Zach.
Mohemed Arshad: Go ahead and perform a express installation
Zach Oxley: Failed. Here's what I see:
Zach Oxley: NVIDIA Update 1.11.3 Not Installed
Zach Oxley: PhysX System Software 9.12.1031 Not installed
Zach Oxley: 3D Vision Controller Driver 310.90 Not Installed
Zach Oxley: HD Audio Driver 1.3.18.0 Not Installed
Zach Oxley: Graphics Driver 310.90 Failed
Zach Oxley: 3D Vision Driver 310.90 Not Installed
Zach Oxley: (which is the same error I get when attempting to install driver version 314.07)
Mohemed Arshad: Generally this occurs if the drivers are interrupted by background running services or programs, we suggest users to install this driver in safemode for successfully installation.
Can you try right click on the Driver.exe and choose run as administrator?
Zach Oxley: Yes, attempted to run driver and got this error: Could not overwrite file "C:
Zach Oxley: C:\NVIDIA\DisplayDruver\310.90\Win8_WinVista_Win7\English\setup.exe". Access is denied.
Zach Oxley: I am logged on as the administrator of the machine
Zach Oxley: it gets to 81% before displaying the error. Sorry my computer is being such a headache
Mohemed Arshad: Strange, not sure why its trying to overwrite.
Zach Oxley: Should I move to that folder and delete the setup file?
Mohemed Arshad: No, Zach. That will make is more worse, because you are getting permission related errors.
Mohemed Arshad: Can you perform a system restore to a previous restore point?
Zach Oxley: yes
Mohemed Arshad: Thank you, please let me know how it goes.
Zach Oxley: okay, will do.
Zach Oxley: Thank you for your help thus far.
Mohemed Arshad: You're welcome
Zach Oxley: Restoring back to Friday, March 1, when everything was working as it should. I'll keep you updated.
Mohemed Arshad: okay
Zach Oxley: Okay, the system has been restored
Mohemed Arshad: okay, let me know if everything is working normally
Zach Oxley: Seems to be installing video card drivers currently.
Mohemed Arshad: Once this is done, it will ask you to restart the computer or you can restart the computer manually.
Let me know what is the driver version that's installed.
Zach Oxley: Will do.
Zach Oxley: 9.18.13.1106
Mohemed Arshad: okay that's version 311.06, a customized driver which was released earlier this year.
Zach Oxley: Okay, let me see if I can update
Zach Oxley: okay, 314.07 is available.
Zach Oxley: well, windows prompts me that there is an available update... but NVIDIA update tells me that there isn't
Zach Oxley: which should I believe
Zach Oxley: ?
Mohemed Arshad: Your current driver is a WDDM driver (Windows Display Driver Model), it a whole set of drivers from Microsoft.
NVIDIA also make drivers for your video card and there is no much difference with WDDM.
This is why you are prompted for a update on Windows Update and NVIDIA Update cannot identify this WDDM driver.
Zach Oxley: ah, okay.
Zach Oxley: will download and attempt an update. Everything looks great so far
Mohemed Arshad: Sure, Zach.
I suspect that this could have occurred due to the drivers that you installed, when you installed the drivers there may be few background applications that could have interrupted the drivers during installation.
Zach Oxley: so I should run this one as administrator, then?
Mohemed Arshad: Yes, Zach
Zach Oxley: Installing right now. Bear with me for one more moment and then I will let you go.
Mohemed Arshad: Sure
Zach Oxley: Screen just went black. Should I plug up the the integrated VGA to see if all is well with the install?
Mohemed Arshad: No, Zach.
The display should come back again.
Zach Oxley: Okay. Typically, how long does the installation process take?
Mohemed Arshad: It usually lasts around 5-10 mins on a average computer.
Zach Oxley: Okay, well with that, I will let you go. Thank you so much for your help. Can't express how helpful it has been.
Mohemed Arshad: You're welcome, Zach.
Its was my pleasure in helping you.
Please do me a small favor.
Zach Oxley: Absolutely
Mohemed Arshad: Please let me know the status of this issue, You will get an email with this chat log, you can reply back to that email to get in touch with me again.
Zach Oxley: I will.
Mohemed Arshad: Thank you
Zach Oxley: Thank you!