Suddenly lost system and all video sound

Hi all,
I am using a HP, Model a6250.uk, Quad core machine with Windows Vista Home premium as operating system. I suddenly lost all system sounds. Further investigation revealed that I can hear MP3s and sound from video games but I cannot hear sounds from youtube or any video website, I cannot hear audio from videos on my computer and there is no sound when trying to listen cds or watch dvds. Additionally, the front green audio port no longer recognises when my speakers are plugged in. I also tested my head phones and I cannot hear any audio what so ever. I have the RealTek HD Audio Manager installed and I used it to test my speakers and I could hear the test sound from the speakers. I checked all volume settings and they are set to max. I hope I described my problem as clearly as possible. Any help will be greatly appreciated.
Regards,  

Hi Gangrene,
Try reinstalling your audio driver: http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=pv-58189-1&lc=en&dlc=en&cc=us&...
Also, watch this HP Support video on resolving sound problems to see if there are any other steps that will help.
Let us know how it goes.
...an HP employee just trying to help where I can, but not speaking on behalf of HP.

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