Uh..Think I messed my phone up?

[fireshot91]

So, yesterday, I installed the Evo Status bar found here:
[MORPH] ?UPDATED! v1.1 Evo 4G Black Bar Mod 8/9/2010 - xda-developers

I decided I wanted to unroot today, so I installed the stock Captivate one from the bottom of that post, and I rebooted my phone...but now nothing happens. It goes to the Galaxy S splash screen, but then after it the screen just goes dark. The bottom 4 buttons do light up, so I guess the screen is on..but it's completely black.

Help