Macbook not fully starting up.

My Macbook, which I have been happy with until now, isn't starting up fully. I get past the Apple screen with the clock and the chime, and it starts OS X. I try to log in to my username (Macbook is password protected), and it will show my background, and stop. It will eventually do the rainbow spinning ball thing, and just sit there. It is starting to upset me, because I haven't bumped it or hit it or done anything that would have caused physical damage to it. I installed a new hard drive about 3 weeks after I got it, which was in August, and it has had no problems until now. The RAM is OEM, and I haven't done anything else to the computer. What is wrong with it?
Right now, I'm trying to Repair the disk permissions, and its frozen again, with the spinning rainbow ball. I'm honestly happier with my PC than I am with my mac.

Try running fsck once.
1. Reboot/Startup holding your Command-S key down.
2. At the command line type the following and hit 'Return.'
/sbin/fsck -fy
3. After it has check/repaired your disk, type 'reboot' and hit 'Return' again. Unit should bootup normally.
If that doesn't work, the only commercial repair utility that's compatible is Tech Tool Pro. DiskWarrior hasn't been updated. Last resort is a reformat.
-Bmer
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