Windows 7: No sound after new videocard installation.

Hello! I am a new member and I have registered here just because I require computer support. Forgive me if I am an XP user and joined an Windows 7 forum. But I hope you can help me out here.
First of all my computer specs:
AMD Athlon 63 Processor 3500+ at 2.2Ghz (single-core)
1GB of RAM
A 2GB Nvidia GeForce GT430 videocard.
My OS is Windows XP Professional version 2002 Service Pack 3.
My problem is:
First off, my computer is very old (I got it around 2005). It used to have a Ati Radeon x800Series videocard, but I had powers with my fan in the powersource so I had it sent to the IT's. I found out that apparently my videocard was malfunctioning too, so I had it changed to a 2GB Nvidia GeForce GT430.
Before any of this happened, I had perfectly working sound on my computer. So moving on to the problem, I got my computer, but there was NO SOUND. I tried to do what I'd always do, that is update the drivers. I tried updating the drivers, get the newest ones avaiable. That sadly didn't work. I checked out on forums that my BIOS might have a problem. So I went into BIOS, went into intergratted something (I can't remember exactly). There were onboard devices. There was the Realtek AC 97 (I think) , somesort of Nvidia Lan and Nvidia MAC Lan. My realtek and the Nvidia device was set to auto, the forums I were on said it should be set to enabled, I did not have an option like that. Some people told me to go to some system manager ( I can't remember exactly) Basically, there you could find the Windows Audio options, I was told to enabled it, it was enabled already. I tried reinstalling windows, nothing would work. Oh and by the way when I go to Control Panel> Sounds and Media devices, it says I have no audio device. I have went to Run>Dxdiag it said "No sound card was found. If one is expected, you should install a sound driver provided by the hardware manufacturer.
" I hope everyone can help me out here.

Go to start and type: Device Manager and press enter. Double click on the sound, viseo and game controllers section and post a screenshot of it using Snipping Tool:How to Use the Snipping Tool in Vista - Vista Forums

I am an XP user by the way, here's the screenshot.
http://**************/image/ys3isoyk7/

I am an XP user by the way, here's the screenshot.
View image: Computerproblem

Its sounds like there's either a problem with your sound card or in the bios. You could try unplugging your pc and takin the cmos battery out for a few mins as this should reset your bios to default settings then try your sound again and see if its working

What is exactly the CMOS Battery? Is it the power source with the fan?

Nevermind! I have removed the battery for a few minutes, then put my computer back together (The battery was really close to the videocard slot, so I had to take it out to remove the battery). Unfortunately nothing worked, I still have no sound

Do you have headphone ports? do headphones work? line out?

do you have a special control panel for the sound or some special sound software at the bottom right hand corner where the clock is? If you do many of them have a "test" feature.

By the way, does your video card have an HDMI port? If it does, it probably automatically disabled your on board audio. The only way to check is BIOS, but I know you've done that already. Check windows sound control panel to see if you can disable HDMI audio device.

My videocard has an HDMI port, I don't have no sound controller near my clock. I also installed realtek HD audio, but it won't show as installed. And I have NO idea how to disable the HDMI port..

Ok here's what to do:

Uninstall the video drivers from add/remove programs
then Uninstall the sound drivers and reboot.

Then, install the nvidia video drivers (latest), CUSTOM.. and disable the HDMI audio driver. It should give you an option to disable it. Keep everything else checked and install the drivers.

After that, install your sound drivers and test.

If you don't know where to toggle onboard audio in the BIOS, this may work as an alternate.