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Why won't my HDMI connected tv play any sound?

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I've had my TV connected to my computer for months and months, but now it's just not working.
I know its my fault, but I'm not sure what I did.
To be completely honest, my brother just gave me his old computer and I was removing his old software.
I know I must have deleted something important. I deleted the NVIDIA drivers.. but when I noticed that it WAS important, I reinstalled it. I'm not even sure if it's from the deleted NVIDIA drivers though because I wasn't playing sound anytime before or after this.
At the moment, the TV monitor shows video. Just no sound. And yes, the green sound bars are moving when sound is playing.

Headphones do work. The built in speakers in the TV does work, just not for my computer sound.

Here's some information on my computer:

Windows 7 Ultimate
AMD Phenom™ 9650 Quad-Core Processor 2.30 GHz
64 bit
HP Pavillion
BIOS: American Megatrends Inc. 5.10

The only sound devices (drivers?) I have are Realtek High Definition Audio and NVIDIA Virtual Audio Device (WDM).
For display I have NVIDIA GeForce 9100.

I'm not sure if this has anything to do with anything, but in System information under problem devices I have NetGear wireless adapter and VirtualBox host ethernet adapter not working.

In the attached file I have a list of my programs.

Here's what I've tried doing:
-showing my disabled devices, does not work.
-installed AMD Catalyst Controll Center.. (but now it's not working and is telling me to install Microsoft .NET Framework)
-Updating drivers
-Restarting computer
-Repluggging wires
-System restore, but did not have saved spot from before I decided to be a retard.
-System repairs/diagnosises
-I've read past forums from multiple websites but nothing has helped.

I'd really appreciate help. I have no idea what I'm doing with these drivers. I'm not completely computer retarded, but this is too much for me.

Edited by confusedidiot, 14 October 2013 - 01:12 PM.

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First and foremost, welcome to Geeks To Go's forums! I hope you stick around after we've assisted you in resolving this issue, as there is a lot of great members and information available on Geeks To Go's site. Now that the pleasantries have been said, let's take a look at your issue and see what we can do to resolve it!  
STEP ONE: Intel Gathering - Q&A
Can you please open up your 'Sound' control panel and go to the 'Playback' tab for me. On here, please take a screen shot or list each device, including what your defaults are set to. Screen shot is greatly more valuable and appreciated if you could be so kind. Also please take a screen shot or list all items in your Volume Mixer while playing something like a YouTube video of sorts. Post these back ASAP! STEP TWO: MiniToolBox Intel Gathering
  • At this point and time I'd like you to get the utility MiniToolBox and run it with the following checked items.
  • List content of Hosts
  • List Installed Programs
  • List Devices
  • Only-Problems (leave it checked)
After you've just the above items, please then hit GO. Once it's done running, which normally doesn't take too long, it will have a text or log file pop up. Please copy & paste that into a reply. [/list]STEP THREE: MSInfo Intel Gathering
  • System Information:
    1. On your keyboard, press the following keys at the same time;
  • Windows Key: Located between your CTRL and ALT key on the left hand side (commonly).
  • R: While still holding the Windows Key, press the letter key for ‘R’.
    Once done correctly, a small window with the title of ‘Run’ will open.
2. Inside the ‘Run’ windows text box (to the right of the word ‘Open:’ ) type the following;

3. Then hit the ‘OK’ button or ‘Enter’ on your keyboard.
4. New window will open titled ‘System Information’ if done correctly.
5. In this window, you will see your Operating System (OS) version after the following ‘Items’;
  • OS Name: This will give you the overall Operating System type, such as ‘Microsoft Windows 7 Home Premium’.
  • Version: This will hold the specific version release, which is handy to post when you inform others of your OS type/version.
  • System Type: This will have the bit version, whether x86 (32bit) or x64 (64bit)
Posting Your Results:
  • You can also choose to select 'File' then 'Export' to a text file, which you can then copy&paste the contents of the text file into a response on here.
Once you've posted back, I'll look over all the intel we were able to gather and see if I can diagnose - Then provide more steps to resolve your issue.

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