New ProView 19" LCD monitor now no sound from my other speakers Dell Dimension 3000

W purchased a new ProView monitor LCD widescreen for our Dell Dimension 3000. our old 15"lcd monitor had the strip speaker on it. this new monitor does not have any speakers but i do have 4 dell speakers and a subwoofer. the monitor has volume up and down but it isnt activating my sound for soem reason.... also this new monitor has only a power plug and a blue video plug ( no audio plug)... will this monitor work on this Dell with Sound or not? and if yes how do i plug speakers into system to make monitor volume work without the monitor speakers? any help please this mon itor was a Christmas gift and the disply will not go to 1400X900 like it says only like 100x640 does not even have the 1400 setting on it.but pixels are clear and are satifyable to me....just the sound issue i need to resolve ASAP please anyone who may assist me my email is foreman1172@mchsi.com thanks