Themes not working

Hi, I updated this thread earlier ( but later realised it's an old thread so I'm not sure if it's closed. I have twentyten and twentyeleven and a child theme of twentyeleven installed on wp3.2.1 all of which work as expected. I have tried installing Business Services and Product but both templates show nothing on the homepage of my website - Product prompts me to edit some widgets, Business Services doesn't. I can edit the theme options in both themes but they make no difference to the homepage. If I search for a page that doesn't exist I get a themed 404, but otherwise nothing. I gather this is something you've seen before, so wondered if you had a fix please? Thanks.