My board it's an Arduino Leonardo, I forgot to metion this in previous posts. And yes, I know what a dead parrot means and seems that Polly doesn't want a cracker no more 
(maybe my english is not so good sometimes, but I can understand or I can google, regarding your advice, an expression).
I spoke with one of my friend and I'll buy another adapter from an electronics store with protection and regulated voltage.
Thanks for your assistance, it was very helpfull.