I hope your speakers didn't get blown out, but if they did I don't know how much it would cost to have them replaced. Is this a fairily new laptop that could possibly be under warranty?
Try my suggestion of reinstalling the sound drivers and go from there.
That's one of the reasons I don't like laptops because it's hard for the everyday person to fix stuff on them. I have a laptop, but it's one that I got free from work because it is extremely outdated running Windows 98. If anything like that ever breaks, I'll just keep using it until it completely dies.
Anyway, please keep us updated.