Sound problems. i can not listen sound without headphone

Then go to control panel,system ,hardware ,device manager option
There if u find any question mark or exclamation mark in yellow Color that means sound drivers are not installed properly
please reinstall sound drivers properly

or else

In control panel , select sound audio devices open it there u have
volume,sounds,audio,voice,hardware options

1)See whether it is mute
2)In audio option select default audio device and recording device
should be same

this should solve u r problem .if it is not solved please let me know u r problem briefly

or else put the model number and brand name followed by drivers search in ww.google.com