HELP! My Xperia Arc is stuck at CM9 startup screen?

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http://forum.xda-developers.com – Hey guys, I was flashing CM9 Nightly onto my xperia arc and it just got stuck at loading with the CM9 guy and the blue matrix animation screen? I followed this tutorial: http://www.youtube.com/watch?v=bdxtOMS4jr0 I did flashed it fresh from rooting and unlocking bootloader since this is my first time doing this. I started with flashing an older android version, then I rooted it and OTA update to later version (maintaining root)...then i unlocked bootloader and followed the tutorial i posted above. All was well until it rebooted. :( Any help appreciated, thanks. (HowTos)