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problem of startup- no dong - black screen

hi everyone! Since yesterday I have a trouble with a macbook white ... it fails to start over. that is to say, AC LED is green.

but when I press power I hear the fan rotated, no jingle dong and black screen ...

I did a smc reset but impossible to nvram pram reset.

I think it's a big problem :-/

Answer this question I have this problem too

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When you press your battery test button how many green lights do you get? Please give us the last three figures of your serial number so we know which machine you have. Thanks Please give us a history of this machine. Try reseating your RAM.

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Hello,

The serial number is: 0P0

it charges the battery because the LED turns red.

when I push power, I hear superdrive, hard disk and fan but no dong.

10 seconds after I hear cut then restart again.

it happens the same thing and the screen remains black

I tested it with another Ram has not changed.

What surprises me is that it does exactly the same thing when I do not put all the ram ...

This is a startup problem

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