My macbook whita 4.1 doesn´t starts.

The other day I was using my macbook white, for some reason I hibernate it. When I wanted to turn it again my surprise was that when I was trying to put my password, the keyboard was not responding and appeared without my pressed. after several attempts to put the password, my computer was locked and a message appeared to me inviting me to try later. I became desperate and took the battery out of my computer (battery is removable), attempting to turn it back on it didn´t turn on .... help me please.
Saul Moreno
Mexico

Saul ...
Follow the instructions for Starting up in Safe Mode
A Safe Mode boot takes much longer than a normal boot so be patient.
Once you are in Safe Mode, click Restart from the Apple menu.

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Hi everyone!
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@Advanced User: I haven't tried that yet, but I will tonight. And I found a Store in my town, in case I cant solve it myself.
@eww: I always buy original parts, even more by Apple. Of yourse I tried without the battery. All the basic tests were done. I also opened the machine and test electrically if anything was interupted. But I couldn't find anything. I must say my son (2 years old) found it very funny last week-end to play piano (pretty strongly) on the keyboard of the MB... But I don't think he broke something, otherwise I'd be really disappointed in a 2000€ notebook...
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<Edited by Host>

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