Me: Will you play some music for me?
Me: Why won't you?
PC: You have no sound card.
Me: I think you'll find I have. Show me a list of all the hardware in the computer.
PC: Ok.. (displays a list of hardware - amongst which is my sound card).
Me: There's my sound card.
PC: Yes, I know.
Me: Why won't you play music through it?
PC: It's broken.
Me: No it's not, it's all in your mind. See if you can find some new drivers for it.
PC: Nope, no new drivers - I'm gonna stick with the ones that are there at the moment.
Me: Ok, but do they work?
PC: Oh yes, they work fine.
Me: But you're still not going to play music despite there being a sound card with a perfectly fine set of drivers?
PC: There's something wrong with your sound card. Don't ask me what - it's just broken.
Me: Ok, take the sound card off your list.
PC: Ok, done. You now have no sound card.
Me: Check to see if there's any bits of hardware in the computer that you don't have on your list.
PC: Okay... A-ha! There's a sound card here! I'd best install that, hadn't I?
Me: Yes, that would be a good thing to do at this point.
PC: Where are the drivers?
Me: Same place they've always been - in fact, the same ones you were using earlier.
PC: Okay, the sound card has been installed.
Me: Ok, does it work?
PC: Should do.
Me: Now, will you play some music for me?
PC: Sure. (plays music)