Turns out my prediction wasn’t quite correct, it was not the Power Management Unit (PMU), it was the heatsink. Mactivate have informed me they have one on order from Apple, so it will take a bit longer than I anticipated to get my Macbook back. I found this strange as I had not experienced random shutdowns like the ones that have been widely reported across the web. it was like I described in my earlier post, something to do with the battery not being able to charge. Then again, I am no expert on this and their is wide evidence (over 1600 people have identified heatsink as a problem in their Macbooks) that the heatsink is a definite issue. Sounds like good or bad I will have a lot more to say about Apple Computer in the future, thats why I have decided to add them as a category.