I use Acer Aspire 4920 and I dont hear anything from my headset .
Go to Control Pannel
- click on Hardware and Sound
- click on Sound
- then your devices should come up ; speakers, Digital Audio, and headphones
- plug your headphones in
- then select headphones
- at the bottom it will say set as default
- select that!!
- then when you disconnect your headphones it automatically switches to the speakers and when you plug them back in it will automatically switch to headphones!