No AUDIO TRIED ABSOLUTELY EVERYTHING !

Hey guys , so i have tried abosultely everything to get my audio to start working again .
Heres the problem
I have a SONY VAIO for less than a year now and the audio all of a sudden doesn't work at all. i called up sony but their method didn't work as the x on the audio icon stilll showed up . i tried numerous methods of getting it to work from forums i've vistied online but nothing.The volume icon on the system tray has a white x over a red circle and when i hover over it , it says

VOLUME O
SPEAKER/HP
REALTEK HIGH DEFINITION AUDIO

and when i right click on VOLUME MIXER, it says
NO AUDIO DEVICE IS INSTALLED

ive tried
1. going into vaio recovery centre and uninstillaing the driver and installing it agian, but nothing
2. i tried downloading the new drivers but still nothing
3. i went to playback devices and checked "show disabled devices" and "show disconnected devices" but nothing still
4. i went to deivce manager and scaned for hardware changes, unistalled and installed, disabled and enabled.. still nothing
5. i tried to download the HD AUDIO CODEC from REALTEK but nothing still
6. a system restore .. nothing still

This has been going on for a month now , and although i am not a computer genius , afetr looking at this problem for the past few days i feel like i know everything about audio , but not enough to fix my problem.

If it helps i have a SONY VAIO VGN-CS16G, i am currently running Vista service pack 2 and the audio i am using at the moment is REALTEK HIGH DEFINITION AUDIO.

THANKYOU IN ADVANCE ! i wouldn't be asking if i wasn't desperate!