Solve : compaq presario 900 laptop does not turn on at all.?

1.	Solve : compaq presario 900 laptop does not turn on at all.?
Answer» So my cousin gave me his old laptop because it BROKE and he bought a much better one. from what i can guess\tell Windows xp home 512 MB ram around 150gb harddrive no idea of graphics card he told me that a month or TWO before it fully "broke", it wouldn't turn on without the charger. im 60% its the battery problem 30% its a motherboard problem 10% the charger broke and the battery is dead. but im open for all HELP and ideas If it works with AC power but not without, it's clearly the battery.

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