Gaby,
Can you explain why you set all the DS to OFF state. You should set the DS to NAND boot mode so that the device can boot. I am not sure why the device is restarting again and again as this is definitely not a software issue and it is hard for us to comment with out knowing your system as to how the unit will behave if it doesn`t boot.
Can you connect to the device after setting the DS to NAND boot and let us know what the value of the Program counter you see. You can also run the debug GEL file on the device and see if the boot completed successfully and the application was loaded in memory.
Regards,
Rahul