Mikrotik rb2011uias-2hnd-in boot freeze

Hi all. I have purchased this router today and i have a problem. I executed a script with my ISP data and more stuff but it doesn’t work. Ok , i think, unplug the device, press the reset button and start again. And here is the problem. When the device reboots, in the LCD only appears the Mikrotik logo and freezes every time that i reboot the device. It only works when i press the reset button and reset again, but i reboot again and freezes every time… Any idea?

I really need your help guys

Thank you all