What is wrong my laptop's sound? again?

My laptop has lost its sound again, this is weird since I can still hear a sound from it yesterday. I’ve searched around the net and tried every single steps but it still doesn’t work.

When I tried the dxdiag test, music tab, only the music from hardware can be heard and the ones from software can’t but it said that all tests were successful.

I’ve tried to update all the drivers but it said that they couldn’t find the ones that better than the ones I’m using. Please help!