OSX will not start up after loading iTunes 5

Just down loaded and installed iTunes 5. OS 10.4 will not start, it hangs at the apple logo. Any suggestions?

Try booting into Single User Mode and run the File System Check. Then, if you can successfully boot up, run Disk Utility and repair disk permissions right away.
FSCK - File System Check
To start up in single-user mode
1. Restart the computer.
2. Immediately after the startup sound, press and hold both the Command (Apple) and "s" keys on your keyboard. The computer will display a series of text messages, at which time you may release these keys.
When the computer has started up, it will display a command line prompt (#). The computer is now in single-user mode.
How to Run the File System Check from the Command Line
Once you have reached a command line, follow these steps to use fsck:
1. At the prompt, type: fsck -fy (NOTE, there is a space between the k and the -)
The fsck utility will go through five "phases" and then return information about the disk's utilization and fragmentation. Once the check is finished, if no issue is found, you should see "** The volume <name of volume> appears to be OK."
If fsck alters, repairs, or fixes anything, it will display the message:
**** FILE SYSTEM WAS MODIFIED ***
IMPORTANT: If this message appears, repeat the "fsck -fy" command until this message no longer appears. It is not unusual for your computer to require several "passes" of fsck, because first-pass repairs may uncover additional errors. Run it until you get two consecutive times with an "OK" result.
3. When fsck reports that no problems were found, type: reboot
4. Press Return.
Hope this has been of some help. Good luck.
OT

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OSX will not start up after loading iTunes 5

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