Probably a usual post, but can't seem to find the answer anywhere! I have got a Tecra M5 running on Windows 7 and the sound was working perfectly until recently I linked up my laptop to my tv and connected an audio jack to transfer sound to the tv so I could stream a football game.
After I had finished and un plugged the cables, the sound refuses to play through the laptop speakers, but when i plug in headphones, the sound comes out fine. I have tried unistalling and reinstalling the sound driver but to no avail.
I hope you must be clear that on this virtual way we can just speculate what the problem can be.
My first thought was that maybe small switcher placed in audio line out jack is pinched or blocked somehow and your notebook “thinks” external audio jack is connected all the time.
What you can do is to check all sound settings and be sure everything is set to “default” settings.