Got a 3gs, JB and unlocked it with absynth and Redsn0w. worked great. (could reboot unteathered, recognised my sim)

Now a day later, it just sits at the appl logo till it runs out of power
I can get into dfu mode, and run any options from redsn0w, and restore with Itunes.
but it still just sits at the apple logo

Does anyone know what happend or how to fix it?

Thanks in advance, this sucks it's my first Iphone and only lasted a day,