I have been the proud owner of the new 13 inch Macbook that came out this past fall since its release. So far it has served me very well, but today it threw me for a loop and got me pretty worried. When I tried booting it up, it would not get past the gray before the Apple logo. I was getting the chime and all, but it would chime and then sit there with a blank white-ish gray screen for the rest of forever. So I tried it again and the same thing. After looking around the Intertubes I figured out that it is probably an issue with the battery. Cue me removing the battery and replacing it back into the system for some reason to see... something. So then I put it back in the computer, tried again, same story. What I tried next worked. I unplugged the Mag Safe adapter and booted the computer up off of battery alone. I am using the Macbook to post right now. I have it working, but I am still worried. I want you guys' opinion as to what might have caused that and what I should do to avoid it in the future. So, long story short: Wouldn't boot up until I removed the wall-adapter and boot up off of battery alone. After I had it on I plugged it back in, shut down, and restarted to see if it would boot up when plugged in. It did. But what's got me scared is the fact that it happened at all. As we all know, these are not cheap machines at all, and I don't want to lose mine. I had to take out a loan just to get this thing. So my question is what do you guys think caused this? What should I do to avoid it in the future? Should I leave it plugged in less? Is it a battery issue? A power-source issue? Is it worse (God, I hope not). Thanks in advanced for any assistance offered.