Macbook (aluminum) shutting down by itself

This is an interesting problem that just cropped up recently.
So this is what I have:
Hardware Overview:
Model Name: MacBook
Model Identifier: MacBook5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MB51.0073.B06
SMC Version (system): 1.32f8
Serial Number (system): XXXXXXXXXAX
Sudden Motion Sensor:
State: Enabled
Alright, about four days ago my macbook was closed and disconnected from the outlet. All of a sudden it turned itself on... Then cycled through the bootup and turned itself off before it even got to the home screen (with all the icons, etc). It did this three or four times before i was able to get it to stop by holding the power key down for ~10 seconds. Just prior to this activity, the only odd thing i can think of is that i was trying to charge the batter using a converter (from US power to Israeli) and it seemed to charge maybe 10% then the hookup at the computer (from the charger) began blinking orange and seemed to stop charging the battery.
Now, when i go to boot it up, it will shut itself off right as it leaves the white mac loading screen into the fading (darker) blue screen. But i have noticed that i can get it to boot all the way up and function just fine if i continue to play with the mouse pad during boot up. So, after booting while playing with the mouse pad i am now using the computer like normal... except, if i dont have any activity (typing or mouse pad) on the computer for ~30 seconds the shutdown window pops up.. ~10 seconds later, if i dont hit cancel, it will shut itself down with what looks like an improper shut down (ie, the screen just goes black and the computer is off). This occurs whether the computer is plugged in or on battery...
Please help! btw im in Israel so my response will be slow

I'm in the same situation, if i dont touch yhe trackpath , the macbook shut down

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