Yo, I had this exact same problem with my laptop.
Good chance that Windows updated your drivers through Windows Update, yknow.
Good chance that if you just go to your device manager, select your soundcard, and
roll back the driver, it'll start working again. I know it sounds crazy for the driver to affect whether or not the speakers shut off when something's plugged in, but that's how it went on my laptop.
Bought a damn USB sound card to replace it before I found out what the real problem was. lol
Good luck!
BobieThe11th
Oh shit that sucks :\
welp, hope you get that fixed,
and I want to but a WiiU but speakers come first so...
larrynachos
Speakers always come first.
Just let me know if you get a wiiU :D