Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
What I would suggest is to remove the power cord, and then press and hold the power button for 15 seconds.. Then, plug it back in and attempt to turn it on.. If it wont stop going through the same loop after that step, let me know.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.
Is it still stuck in the loop?