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I had a problem with a sound card on a Dell machine. All test showed it was working fine but it still produced no sound. I tried reloading the driver and then tried a newer driver going to the manufacturers web site for support and it still did not work. I did make an observation that some Windows sounds (like a new email) was coming through. I use HMDI for both sound and video so I wondered if by chance the video card (Nividia) could do it all. I removed the sound card but nothing changed. I went into BIOS and found that there was a sound card integrated into the MB. I activated the integrated sound and now all works beautifully and the original sound card sits on my shelf. If you have an integrated sound card make sure it is not ON if you also are using the discrete card and also if you remove your discrete card then turn the integrated on, It worked for me.
Your Device Manager not registering the device is worrisome. Maybe remove the card reboot and then shutdown reinstall the card and reboot and see if it picks it up. Oxide or dust on the pins can be a problem. There are parts cleaner sprays that help, the fumes are strong so make sure you have good ventilation and try not to breathe any more fumes than necessary.
It sounds to me like your sound card drivers are missing.
Try to use external or internal sound card, if you find it working it means that the sound device of your Sony Vaio is the real problem. This means that you have to use another sound card device to be installed in your Sony PC, because built-in soundcards is connected to the motherboard of the PC so fixing that problem will cost you a lot.
try downloading the audio driver and install it.
if you are using Sony VAIO PCV-J200 you can download your audio driver here
There are TV/Monitor hybrids out there. You could get a 60'' plasma widescreen and use it as your desktop monitor for example. But as far as watching 'streaming video' from like....HBO from your local cable provider, you will not be able to do it with this computer unless you purchase an add-on card (be sure you have the open PCI slot first).
You would need something like the cards listed in the url below (again, be sure your motherboard is compatable with it first).