Ruby Web App not loading in IE or Safari ... only loads in Firefox

I have been developing my ruby on rails web app and testing it out
using Firefox. Today I tried a different browser, Safari, but when I
went to my index page nothing rendered. I viewed the source, and all
the html is there, but the browser is displaying the page as a blank
white screen. This is also true for IE. The only browser my site
renders in is Firefox. Anyone run into this problem?? Any ideas??
Thanks in advance!

LAB

LAB wrote:

I have been developing my ruby on rails web app and testing it out
using Firefox. Today I tried a different browser, Safari, but when I
went to my index page nothing rendered. I viewed the source, and all
the html is there, but the browser is displaying the page as a blank
white screen. This is also true for IE. The only browser my site
renders in is Firefox. Anyone run into this problem?? Any ideas??
Thanks in advance!

Take out any reference to a stylesheet and validate your (X)HTML.