Dell demension 4600


I have no sound to my computer and also it tells me to
insert a sound card, I don't have a sound card I bought the
tower from a family member who said it was working fine but the thing doesn't
work for me.
 
Yes there are conflicts that are yellow
Primary IDE Channel
Secondary IDE channel
Ethernet controller
Pci Modem
Sm Bus controller
Universal Serial Bus (USB) Controller
Video Contrller (VGA Compatibe) All of those are yellow
 
It sounds like none of the motherboard drivers are installed.

You can download the drivers here.
http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=DIM_P4_4600&os=WW1&osl=en&catid=&impid=

If you have any questions, feel free to ask.