Sound?

I've been having problems with my computer for a while now. It's old and I think it has a virus. The newest issue...suddenly I have no sound. The volume is up...I'm too tired to check cords. I'll try that later. I actually did buy a new computer and printer (my old one is also acting up) but I haven't hooked them up yet. I need to figure out all my DSL stuff and make sure I keep all the files I need...and figure out how to get my iTunes library on the new set up. However, I need to get the house in shape for my folks before I figure all of that stuff out. Soon though-fast computer and printer that prints when I ask it to do so!