I need help

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I have been trying to run the original scripts and EA of metaquotes provided in the MT4 platform, but they 
do not perform the expected actions. for example, the close script does not close any open position. why?
how do i make it work if the problem is mine. i trying to study how the EA and the scripts work so i
can develop mine. But they do not work as expected. The MACD EA does not open or place any order. Please someone 
should direct me on what to do.
 
Did you put the close after the start?

ie

int start()
{

close();

}

What does your journal say when you run the MACD ea?
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