Acer Aspire V V3-572P-540V no sound from speakers, only headphones

Greetings. I recently had my laptop repaired (not though acer :l), after I received it and took it home, thinking all is well I tried playing audio but nothing came out of the internal speakers. It only played through headphones and external speakers from the jack. It did this before and I was able to fix it by reinstalling the drivers and plugging the headphones into the jack and wiggle it around, that worked the first time. It didn't now. Is this a hardware problem? Could they have had disrupted something while fixing the other problem? 
Edit. There's also a slight knocking-like sound where the speakers are when audio is played, it can only be heard when you have it close to your ear.