Hi, I have bought Acer Aspire 5920 Laptop in India. For a quite good time, its speaker system and headset worked well. But recently, when In inserted headset pin in the jack, its inbuilt speakers are not switching off and also the headset output is not working. Can any one help me. I have Realtek HD Audio output as driver.

Try a different headphone to make sure it's not the headphones that are broken.