I upgraded to 2.2 officially with kies mini and whatnot from the samsung website. No, my phone is not rooted nor am I running any custom ROMs or anything. Everything was going well, and once the process was complete, the phone restarted itself, and now it won't function. After the ATT screen comes up, the "S" galaxy symbol comes up and shines as usual, and then the screen goes black. The phone buzzes every 30 seconds to a minute very briefly like when it first turns on, but nothing works. I've pulled the battery, plugged it in, and it still goes through this process. Help. Please.