Pavilion dv7t-4000 laptop: AMD HDMI port on the computer laptop dv7 is lost after free trial Win10 returns to Win7 Home Premium edition

My laptop was purchased in sept 2010 and runs Win7 Home Premium Edition (64-bit).

It worked perfectly until June 2016, when the trial version free odious Win10 forced itself on my laptop.  I had no choice, I used Win10 for a day or 2 and then discovered that:

(1) I lost the audio capability, HDMI port, I use to connect to my TV, and

(2) the Win10 trial enabled me to return on Win7, I did without delay.

In my Win 7 restored, everything was fine, except when I have her go in Control Panel to configure / reconfigure HDMI as the default, I couldn't - the element used to appear as "AMD HDMI Audio" is no longer displayed.  I remember a message during the free trial period Win10 that says it has disabled any material incompatible.  Without a doubt, Win10 free trial 'killed' this HDMI/device port, at least audio-wise.

Today, I always run the same Win7, but I can't have audio HDMI on this port.  When I connect to my TV, the video works.  Win7 Device Manager it shows with an exclamation in yellow, and when I right click to get more details, there is a message saying Microsoft:

Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might be installed a file that is signed incorrectly or damaged, or maybe it's a malicious software from an unknown source. (Code 52).

Is there a way to 'get it '?  'this' is AMD HDMI audio.  (and wthout spoil the graphics - that is, video)

I tried to install the drivers provided by AMD [graphics] and that did not work. The Internet from AMD website says that the audio drivers are included in the package for graphics drivers.  There is also a huge confusion in the way these low level items are named/described: ATI and AMD, because they have merged, were used somewhat interchangeably.  I also tried the graphics drivers AMD HP Support Web site specific to my laptop and it has only gotten worse.

Thank you for your kind attention.

Hi @ RTX,

Awesome response. I read the details and depth of your post. I understand that the bios is updated. So you could end up with this update.

Happens to the other updates. This will be the order.

1. Uninstalling the driver Chipset and resettlement.

2 reinstalling and uninstalling graphics drivers

3. uninstall the sound drivers and reinstall.

Before uninstalling, you can try to update the drivers supplied by device also Manager and if that market that will be great. Please, do it only if you don't have already done.

Before uninstalling please make sure that you capture an image of the complete Device Manager window. Take some pictures of your cell phone. Please note the exact device for audio and video chipset drivers. Then, you will need to uninstall it from the Device Manager and install from the support site in the above order so that there is no confusion.

If nothing works as a last resort, you may need to restore complete system to factory settings. Please backup your files before doing so. This is possible since the recovery of your computer's hard drive partition.

Link to the system recovery: http://support.hp.com/us-en/product/HP-Pavilion-dv7-Entertainment-Notebook-PC-series/4284279/model/4221688/document/c01867418/

Please hold me. I hope that it pans well.

Just to say thank youPlease click the ' Thumbs Up ' button to give a Kudos to appreciate my efforts to help me. If it helps, Please mark this "accepted Solution" because it will help many other people with the same problem to get it resolved without hassle.

Now carefully and have a wonderful week ahead.

Tags: Notebooks

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