dv2000 intel

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hello all,
i have this dv2000 intel 945gm video.the problem is the laptop comes on but the cpu core does not trigger.I have changed the cpu chip max8736a also changed clock gen ic still no core no voltage on the cpu .all supply is okay 3.3v 5v 1.8v 1.05v all okay.one thing i have noticed one you switch on the laptop you cannot power it by the power switch. and there is no 14mhz signal osc of the clock gen ic.where can the problem be anyone please help .
thanks

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