Macbook Keeps Shutting Down ???

Hi

I have serious issue with my Macbook, it keeps shutting down for no reason at all, after switching it back on again for 5 to 10 minuets it then shuts down again. Not multi tasking with big applications and no over heat fan issues, i had to be quick to write this post before it shutdown again.


What is happening to my Mac?

Macbook 5.1 OS X Loepard 10.5.

I could be wrong but i think i had the (Energy Saver Levels) in preferences way to high? example, i had the battery levels set to 30-min for display sleep and 1-hr for computer sleep.

It was when i was using the Mac on battery that it kept shutting down, but when re-setting Energy Levels to a minimum and using the power adapter all was fine again.

Ohhh i was really distressed about all that, could anyone comment on wether I'm right about the Energy Levels? as i thought before shutdown there was a pop up to confirm how much time was left?

Thanks.

Moved to appropriate forum.