Help - EVO Brick?

[CtDMonet]

Hmm. I was running WarmTwoPointTwo, and having trouble installing SPB MS5.0 Beta. It kept giving me a network problem. I thought I'd flash a clean ROM then try the MS install. I had heard good things about CM7, and tried to flash it, through ROM Manager. It appeared to lock up on a black screen, so I popped the battery and restarted recovery.

If I try recovery, I get black screen of death (with a phone picture and red warning triangle?). If I simply reboot, I get skateboarding android on infinite loop. I saw on this forum (a little farther down) that I could "format all.zip" and start fresh. I don't really know what that means. I mean I pushed format all.zip there when I rooted the phone, but I don't know how to get there now - I think I forgot everything when I started using Rom Manager (and I really didn't understand all of it then). Help?