Hi Britannia – Are you using the CBOX theme? Just wondering…
For the homepage slider, if you click on the image, it will take you to a page where the featured image (from the slider) is displayed horizontally, at the top. But if you use the following CSS (which will not affect your slider functionality), you can hide that featured image at the top of the page (you would need to replace xx with your specific post id, if you want to do this on an individual basis) :
#post-xx .postthumb img {
display:none;
}
Or if you want to do this for all sliders (and pages and posts), try this:
.postthumb img {
display:none;
}
For regular posts and pages, I think you have to specifically designate a featured image. So can’t you just not assign one if you don’t want to display it?
Maybe you can provide a link to your site if this doesn’t make sense, and show us where you want to hide the image? Maybe what your seeing is actually not a featured image?