I now have yet more problems with my Mac Book, I bought mine last year, almost a year ago, shortly after they first came out. Worked great until this past Christmas, when it would no longer turn on when the battery was in. It has only shut down on me, 2-3 times in the year I have had it. So at least I am fortunate to not experience the RSS (random system shutdown) problem that thousands experience.
Using the OS has been great. The machine while working is great. It is unfortunate that it is not reliable enough to use for work.
Lately it has been running well, however today the led on the magsafe connector flashes between orange and green. The battery monitor changes from fully charged to 99% charged reflecting the color on the magsafe connector.
Youtube video detailing my exact issue.