wrong rooted xperia s

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http://forum.xda-developers.com – a few days ago I tried to root my xperia S to get more functionality. So i read on the internet on several blogs and started to download a rom. First i unlocked my phone with fastboot.exe. Then i try to boot via Command prompt. It says everinthing was okay in about 120 secs, but when i disconnect and tried to start my phone, i only got the sony logo and that was freezed. Even if i reboot, it cames again. I've tried some other ftf files to flash, but nothing worked. Now my battery is empty, and i don't get the phone back in fastboot mode. Anyone have tips for me? Im very new in it so please (HowTos)