Updated my 2G iPhone with the correct 2.0 install. Got some Apps. Worked OK for about a day. Today I can't get past the startup screen. I've done half a dozen hardware resets and it'll remain at the Apple startup logo for hours. Plug it into my MBP, it will freeze iTunes with an indefinite 'working pinwheel' and its startup screen will remain lit up for hours and never get past start up. Help