iPod white screen after repair the screen.

Hi, I replaced the glass to my ipod because rotto.Ho mounted all as examples on you tube and your guide. When I turned on the unit appeared to me the apple and the first screen. I turned off the ipod again to complete the sigilltura but to restart the screen is completely white.Ho tried using the on / off + home but the power goes off (apparently), and then power cycle alone but always with the screen white. In fact, I can not turn it off. ? There anyone who can give me an answer.

Sorry for the language, but the application has been translated by Google.

thanks