Bricked Samsung Galaxy S3 Mini

I have an unlocked Galaxy S3 Mini (model number SM-G730A). It's technically an AT&T phone, but I use it with T-Mobile. I rooted it with the Saferoot scripts (I think you can find them at http://ift.tt/1anPfhg). I tried installing Clockwork Mod Recovery, which is where the problem started. I tried the method shown at http://ift.tt/1DEz3rr. Now I notice that the thread has the model number I8150 at the top, but I didn't notice this before. I followed the steps in the forum, but when I rebooted, it stopped at the Samsung Galaxy SIII Mini screen, except it was only half-formed. It only said Samsung, and then black. Then the screen started to go moldy: it gradually turned from black to green to pink to a bunch of white lines. I'll see if I can post pictures. I can get into recovery mode or download mode. I've tried a factory reset to no avail.

Okay, I'm trying to get pictures now but it now restarts at Samsung Galaxy SIII Mini (or rather, Samsun) If I plug it in, I can get to the charging battery screen but the same psychedelic screen phenomenon returns.

Any ideas?