Macbook won't turn on after trying to install windows

Guys, I'm really desperate here.. I was installing Windows XP on my friend's macbook pro and it suddenly turned off (it didn't have much battery left).. then we tried to turn the macbook on again it just won't turn of.. we press the power button and nothing happens
can someone help me here please?

Did you re-charge it fully? How do you go about installing software or doing something else important and not being connected to live power?

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