Macbook won't boot up completely

So, my three year old Macbook Pro encountered an issue today. Preview froze up, and then froze the whole computer. I did a hard restart and the light blue screen came up, with the apple logo and the spinning icon on the bottom. After a minute the apple logo left and a circle with a line through it appeared, and no progress booting up was made. I did another hard restart and the computer then booted up normally. About an hour later, the problem repeated its self, and no amount of hard restarts will fix it. It just stays stuck on the light blue screen. For a minute the apple logo will appear in the middle, then it will be replaced by the circle with a line through it. The spinning icon on the bottom stays.
Thanks.

Go to Applications>Utilities>Disk Utility, look at the bottom of the Windows for Smart Status, then run Verify Disk, post back.

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Macbook won't boot properly.

Macbook won't boot. When turned on, it starts clicking; after a while, I get a gray screen with a blinking folder in the middle that has a question mark on it. After a minute or two, it shuts off.

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<When iPod is plugged in at startup, the MacBook does not startup; unplugging iPod lets it startup.
yes, it seems that the kernel is not loading
<After resetting the iPod and BEFORE synching it, there is no problem. Any type of synching seems <to make this problem recur.
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yes
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My Macbook won't boot up because there isn't enough free space for my start up disk. It's now stuck on a blue screen. How am I meant to delete files to free up space if I can't access the computer?

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For Mountain Lion v10.8 > OS X Mountain Lion: If you see a blue screen at startup
For Lion v10.7 OS X Lion: If you see a blue screen at startup
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My MacBook won't boot past the grey screen showing a folder sign with question mark, My MacBook won't boot past the grey screen showing a folder sign with question mark, My MacBook won't boot past the grey screen showing a folder sign with question mark

Hi, I need some serious help immediately. I have been using an external hard disc to watch movies and stuff on my MacBook. However last night I removed the external hard disc accidentally without closing the programs that were still using the data from the hard disk and hence the complete MacBook got hanged and nothing responded. I tried using command Q to shut down the program buy it didn't help either. So finally I gave up and shut down the MacBook manually by pressing the power on/off button.
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Awaiting quick response
Gratitude in advance
Regards
AJ

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Macbook won't boot up completely

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