X-Fi card possibly damaged, how do I revert to on-board sound?

I can't figure out how to revert back to on-board sound on my PC.
What's actually happened is I've been using X-Fi happily for nearly two years. I bought it with my system, and apart from some minor troubles right at the start (I bought a Vista system right when Vista was released, and the X-Fi drivers for Vista weren't quite ready) I've been happy with it. I'm not a sounds guru or anything, I got X-Fi mainly because I'd heard it was the only card that could play DVD-Audio discs, and I have several albums on DVD-A that I wanted to hear in surround sound.
Anyway, at Christmas I was given a new LG blu-ray reader, and some more RAM for my PC. So last night I opened the box up, swapped out my old IDE DVD writer for the SATA blu-ray dri've, and swapped 2GB of RAM for 4GB. I also gave the inside a vacuum while I was at it. I've only got a big, unwieldy vacuum cleaner, but I was careful, and I'm 90% certain I didn't scratch or even bump anything while I was doing this.
But when I booted my PC back up, the sound that came out of the speakers was a horrible high pitched screech. I've taken the X-Fi card out, checked it and plugged it back in a couple of times. I've rebooted the PC several times, and I either get no sound at all, or the horrendous noise (interestingly, when there is no sound at all, I can load up WinAmp and play an mp3, and watch the little bars jumping up and down as a song I can't hear plays - however, if there is horrible screeching, WinAmp locks up).
I can only assume that I've damaged my X-Fi card somehow. Or there was an internal cable plugged into it that I've knocked out (although the X-Fi manual doesn't mention anything other that plugging it into the mainboard), or that somehow more RAM or a second SATA device is interferring with it. But that all seems unlikely.
So, if my X-Fi card is damaged, I would like to, for the time being, start using my on-board sound. I removed the X-Fi card and plugged the speakers into the mainboard outputs, but got no sound. Then I noticed some power pins on the mainboard labelled AUDIO, and plugged one of the loose power cables that matched the pins into it, but still got nothing. According to the Device Manager, all my hardware is working just fine (including the X-Fi card).
Sorry if the post is long.

B? Most likely onboard sound is disabled in BIOS
You know how to enable it's just enter the BIOS, press Del, F2 or F0(depends on you motherboard) at boot and search for Integrated peripherals set onboard sound to enabled or auto
When Windows starts it should detect the audio device and asks for drivers
Also just to be sure test the X-fi in another system if you can?

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