my n900 also did not boot..its stuck on multi-boot..

when i press power button, nokia logo appeared then next is multi-boot menu, when i select an item, from 1(maemo)-2(nitdroid)-3(kp50)-4(back-up menu) even 0 it wont boot it just stuck on running script then hangs..

i also try to flash it but when pressing u will pluggin in to the pc, usb icon did not appear then running scripts without backlight then steady orange led ..