My M17x says "no speakers or headphones are plugged in", HELP!

Hi everyone,

just now, i have encountered an issue, the sound of my M17x is not working, it says "No speakers or headphones are plugged in", now let me clarify-- i have tried every headphones and speakers i can get, its still not working. Besides, the laptop's own speaker is not working either.

The driver seems working properly, no issues were detected, i ran troubleshooter in windows, and no issues were dectected either. It just says there are no earphones plugged in.
I havent made any changes recently to the laptop, and even 2 hours ago the sound is still working perfectly. I went to sleep for two hours and turned off the computer, when i woke up and turned it back on, it has been like this.

I have searched on google, and microsoft says that this is because that the integrated sound card is not enable and says if i enter BIOS and enable it everything will be fine. This might be true, because i think my current audio card is not the integrated one, it is AMD High Definition, i suppose it comes with the video card (7970m)

however when i entered BIOS and i cannot find this "enabling integrated audio card" feature, it is nowhere to be found
on the first page it just tells me if i am using my integrated video card or the discrete one, which i have disabled the integrated Intel video card by fn+f7 (i wonder if it has anything to do with this? but i disabled it like 2 weeks ago, it cant be can it?)

I am desperate now, can you help me.?

 

I have the exact same problem. Normally switching GFX cards sorts the problem out but now its stuck saying "no speakers or headphones are plugged in" with a red cross.

Are there any fixes for this or is it a send away job?

 

For anyone interested. I managed to find a fix that has worked so far. http://forum.notebookreview.com/alienware/690627-alienware-m18x-r2-m17x-r4-audio-fix.html