I think that I found the problem!!!
I read this pdf ,sorry, in Spanish http://picmania.garcia-cuervo.net/recursos/teclado_at-ps2_interfaz_y_funciones_v1.2.pdf
at page 29 (marked as 23), first paragraph tell that a constant 0xAA flow with incorrect parity bit is sent froom the keyboard to computer waiting for a "incorrect parity" 0xFE message from computer to cheack that teh computer is on.
Now I will try to modify the Ps2KeyboardExt2 library to check the parity bit and reply with 0xFE to the keyboard.
Also I'm thinking in send a RESET comand 0xFF beacuse when do a sofware reset do not send a a constant 0xAA flow.