Logically, if it freezes at the Nokia screen it means something isn't right with the boot up (sort of like BIOS in PC). While I haven't experience it myself I have seen something similar like this on Windows many times. Sadly the only solution to it is using the Nokia Recovery Tool and re install the OS\Firmware, I do not know though if you lose all of your settings or not, if you do, I hope your last backup wasn't long ago.
Tell us if it works out