Sound Card Monitor Why Do My Integrated Monitor Speakers Not Work, Whilst All My Sound Settings Are Fine, And My Sound Card's Ok?

Why do my integrated monitor speakers not work, whilst all my sound settings are fine, and my sound card's ok? - sound card monitor

I got a new AOC L19WH, in use with a new Packard Bell computer with XP Home. I have broadband and I have Norton AntiVirus.
My speakers do not deliver the integrated, but you can Skype, when the headphone jack is right in there anything online about this monitor (two hits!) And I went through the store. Any help welcome ...