I broke my site's stylesheet – Help?

Hello, I was fiddling around with W3 Cache trying to “Eliminate render-blocking JavaScript and CSS in above-the-fold content” per PageSpeed Insight’s recommendations, and I apparently broke my blog’s CSS.

I still haven’t figured out how to eliminate the above the fold content (I’ve read all the previous threads about this and managed to eliminate most javascript and css), but my top priority right now is getting my stylesheet to kick in when the site loads.

I may have caused this problem by using Minifying the js/css and trying to put them in the footer, but I’ve since tried to reverse this. Apparently the reversal did not work.

My blog is LASnark.com. Any help will be appreciated.

I am currently using the Hiero theme, but I am looking to switch, so if switching themes will fix this, that is fine too.