Today, I try to flash new Rom on my Galaxy fit and it goes the same way as you've experience. I believe that bringing our phone to Samsung Service Center's will help us to get rid of this problem, but one thing I want to remind you: Whenever you ask by the Samsung personnel what happened to your phone, just make a lie, DO NOT say the TRUTH that you rooted your phone because rooting our phone is actually voiding its warranty. Just tell an application update problem... Just make a WHITE LIE, its for your own sake after all. And also, Samsung personnel never found out what the true cause of the problem is, unless you said the truth, after all the phone has never been turned on after the incident... Hope I can be a help for those who are panicking right now.. Like Me. Hehehe