Macbook starts up half way

Ok, my issue here is this: When I push the power button, the light comes on, you can hear the fans start and then it just clicks off and it's dead. I half to keep pressing the power button and even hold it down to turn the macbook on. Any help?

sounds like what my macbook was doing when it was well into the RSD (random shut down) issue...
have you had your macbook shut down on you without you initiating a restart or a shutdown? you will have noticed, as the screen will turn black without a warning, within a second and in many cases the only way to bring the machine back is to hold down the power button until it beeps...

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