PCG-9L1L won't boot up; please help

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I am trying to repair a PCG-9L1L Sony Vaio laptop that won't even boot up at
all (no signal on tft screen or external monitor-the hdd doesn't spin).
After replacing the power board, the power led is green, but still the
laptop won't boot up. Now, to my question, there is a cable connecting the
power board with the motherboard, should I try replacing that also? Could
that cable be faulty? Any help will be much appreciated. Where I live
there's no authorised sony service center for vaio laptops (they only repair
tvs and stuff).

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