Playback changes to SPDIF interface, speakers are unplugged

Hi guys,
Yesterday I experienced a huge problem of sound... there WAS no sound.
I made sure the volume was up 100%, nothing was on mute, and I clicked on the volume icon on the status bar.
The icon was not a speaker icon, instead it was like a black box of a DVD player of some sort. I checked the devices for sound in the PLAYBACK tab (Control Panel, Hardware and Sound, Sound), and it said:
Speakers
High Definition Audio Device
Not Plugged In
SPDIF Interface
High Definition Audio Device
Working
What I don't understand about the Unplugged speakers is that, I am using an HP Pavilion dv6823 Entertainment Notebook PC (Yes, I know it's old and I haven't used it in a long while) running Windows Vista 32 bit (x86)
Yesterday I upgraded from Service Pack 1 to Service Pack 2, and before Service Pack 2 was installed, the sound was working perfectly.
Any help?

remove your external graphic card to test
did you install the correct driver, find at your graphic card manufactured site for update driver and find update for your audio driver or try to reinstall them, updating your chipset sometimes solved this kind of issues 

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