I'm a first-time Mac user, having bought a Macbook about 3 weeks ago. It's the most basic version with a CD/DVD combo drive and 120 GB hard disk. For about 2 weeks it was working fine and I had some new programs installed, like MS office, Xee, Adobe and Neo Office. Now, for almost a week, my Macbook has been acting weird. Like, sometimes, I see that there's a colorful circle twirling on the finder menu and when I try to shut down, everything disappears - the cursor, Finder and dock - except the wallpaper. And then I have to shut it down manually. This has happened thrice so far and I can't imagine it's good for the laptop because it takes a bit more time to start up now. I should also mention that my Macbook isn't connected to the internet so I haven't installed any OS updates; I saw in the applications folder that the preinstalled programs were there from February 2008. Can anyone tell me what the problem is? I'm really scared and I hope to God it isn't a hardware problem . Has anyone else faced the same problem? Are there any Apple updates to fix this? Please help me!