Hello to everybody,
I used a OLED 32 grafic display in a project driven by an Arduino MINI PRO board; but unfortunatelly I was not able to see anything in the screen.
Previuosly I used the same program with a Arduino UNO board, and everything went well.
I run a I2C scanner and my device is seen at 0x3C addres; so it is connected and works regulary.
Advanced thanks to everybody will help me.