Originally Posted by rimom
unplugged the inside speaker cable thought i can use it only via headphones - won't buzz anymore but i don't get any sound out on the headphones jack
So you probably nailed it with that step right there... though Krazy makes a great point, that it could certainly be environmental, so before replacing any parts, I'd do as he suggested and move around a bit, or even leave the house with it and see if it persists.
It's not uncommon for a speaker/speaker cable to go out, ..hopefully if it is hardware that it'd be that, and not the connector on the motherboard.
Y113N Speaker module, 1010 ASSY,SPKR,1W,25X12X4.6
For the cable, I'd need to be at work to be able to tell if it comes with that module, or if it is a separate component.
Hopefully though, it'll be something environmental causing it since that's the easiest fix.