asus X71SL sound card and speakers problem

Hello. My notebook is Asus X71SL and I have some troubles with sound card and speakers: when i play some music or anything with sound my speakers doesn't work anymore (laptop built-in-speakers). when i connect some headphones, sound card doesn't work either.
I've installed many drivers from official website assus support, form other sites and nothing.
Now i use an external usb sound card and everything is ok, but laptop speakers still not working - and internal sound card too...

Does anybody know what the problem may be?
PS: sorry for my english!

OS: win 7 32bit
Asus X71SL, Core 2 Duo 1.66 GHz, 3 GB RAM, 17'' wide screen, nVidia 512MB 9300M GS - graphics.

 

If you go to device manager do you have any unknown devices, or devices with yellow exclamation points or red icons?

 

I have 2 things named "Base System Device" with yellow exclamation.

 

Maybe you need to reinstall your intel platform drivers, called the 'inf update utility'

http://downloadcenter.intel.com/Det...hipset+Software+Installation+Utility&lang=eng

 

I tried to reinstall inf update utility drivers and nothing...
is possible that both speakers to be damaged? or the sound card may be the problem?
...and thank you for your answers ALLurGroceries

 

In that case the missing driver for the base system device is probably for a card reader or something else.

If you find your soundcard under device manager and right click on it and then select properties, does it say something like 'device cannot start' or have some other error message under its status? That could imply a problem with drivers, or a hardware problem.

If device manager shows your sound card as working properly, and there aren't any clues from the audio control panel or windows sound mixer, then it could be a hardware problem. Does audio play normally when you select the internal sound card as the default audio device?

You can try using a linux livecd or liveusb (unetbootin with ubuntu is easy enough) and test playing sound there, that would rule out a hardware issue.

 

In device manager shows that sound card is working properly. when I select internal sound card as default from playback devices, i'm not hearing anything, but on the sound mixer where i can modify volume % i can see that green signal as if it would work correctly. Now i'm 80% sure that is a hardware problem... i'll try to test it under linux and see what happen'.

Thank you for the answer.