I've got a HP Pavilion Sleekbook 15 PC with Windows 8, I got the computer May 18, 2013 and it works perfectly except for some random times when I plug my headphones into the side jack (the only one on the computer) it will also keep playing out of the speakers. There will be times and it will turn off if I leave the computer turned off for a while and go do something, but that hasn't seemed to work this time. I've tried having a friend look at it and he didn't know what was going on. It started happening the week after I got it, so I didn't have anything on the computer downloaded yet, so I refreshed the system, and that didn't do anything either.
It's also saying that the speakers and headphones are one, even when the headphones aren't plugged in.
and is saying something about the front analog panel jack, which doesn't appear there when everything is working fine.