I had the same problem.
Brand new, the red led doesn't turn off even after 8 or 9h. I was just filling the amazon prints when i remember to search on youtube and 've found this possible solution:
"Try to press and hold all 5 buttons together for about 30 seconds, then press and hold on/off button until it turns on. If the later doesn't work, try pressing it quit few times in a row and then try again. It worked for me. Hope this helps."
It worked in my case, it doesnt have to be 30 seconds... 5 or so was enough for me, but it worked.