For a start, ensure that standardStylesheets="false"
is present in the page definition.
Then, make sure you have something similar to this (you need both css and javascript for this sort of bootstrap component to work:
<apex:includeScript value="{!URLFOR($Resource.my_resource, 'my_resource/bootstrap/js/bootstrap.js')}" />
<apex:stylesheet value="{!URLFOR($Resource.my_resource, 'my_resource/bootstrap/css/bootstrap.css')}"/>
I also had some trouble getting the bootstrap component to load automatically and called my own in the onload
function, ie:
j$ = jQuery.noConflict();
j$('.collapse').collapse();
Finally, if it's still not working, do as the user @rao says - depending on what browser you are using, examine the console errors that appear.