see diagrams starting on page 18
https://www.intel.com/Assets/PDF/datasheet/307502.pdf
This is a controller chip which also contains the video ability. So, if the video part was dead, the chip on the motherboard MAY have other problems.
As for the sound, unless you have installed the sound driver files from the manufacturer, it's not too surprising your sound isn't working yet.
I have an HP a6120n desktop that I got a few years ago with Windows Vista 32 bit and 2 Gb ram. It’s still a decent machine. I since upgraded to Windows 7 Pro, and then MS was nice enough to upgrade to Windows 10 without even asking me (I actually said NO many times).
I put in two more gigs ram and another 500 gig hd.
I lost Ethernet access on it the other day. After checking the modem, I took it to a local repair shop who showed good reviews on yelp.
He said the video card is dead, and put in a GeForce 210..and marked it up 200%. I wasn’t sure what the video had to do with it, but he said it’s an integrated chipset. The Ethernet started working again, but I had no sound. I took it back, and he couldn’t figure it out. So he said he’d reinstall Windows 7 Pro 64 bit.
The way he ran it all down to me seemed kinda weird, but I thought I’d go with it since I had few options.
Does any of this sound right to you?

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