Yes when I power on the unit it goes to loading maps message then followed by a white screen. The unit is unresponsive to pressing the screen. So no option to reset or do anything. On the odd ocassion if I hold the power on/off button a message will say its switching off. But thats it, it just will keep cycling between loading maps, white screen, loading maps ..... Thanks Butters

Flashing attempt has made no difference since I dont think anything was actually sent to the nuvi. The progress always said 0% after initialising.