[solved] Flashing squares on the screen

I installed osmc in my raspberry pi 2 and I visualize in the top right corner of my tv two flashing squares (red and blue).
I thought it was an hardware problem and I tried with another raspberry pi 2 but I have the same problem.
I attach a picture with the squares.


The rainbow is a low voltage warning that indicates your power supply is insufficient.

thanks, that was the problem, I changed the power supply and now the squares are gone away :smile: