Youtube sound FUBAR WTF?

[cYcLoNe]

So I went into "funny stuff" and watched an embedded
youtube video with no sound and I tried another, also
no sound, checked youtube's main site, also no sound.

So after checking every wire leading into and out of my
speakers, confirming that sound is working on my PC
by playing an .mp3 and a video from my hard drive I am
left stumpped. And no, hitting the speakers didn't help.

It's only affecting youtube, viddler etc. streamed videos

Any techies out there got a clue what I may have done?
It was working fine yesterday, an Adobe update is the
only thing I can remember doing today if that helps.

Should I hit the speakers harder?

I'm using FireFox 3.5.2 on windblows XP PRO SP3
and have a soundblaster 5.1 card.

[cYcLoNe]

Crisis averted,

somehow, and I seriously have no f'n idea how my
PC decided to change audio options on its own and
was trying to play sound out of the modem port.

o_O