My Mac does not respond during login

I am using OS 10.5.2
My iMac does not respond during login. After the desktop and dock are shown, the ball (cursor) keep rotating. I can do nothing except moving the cursor. All application including finder do not respond. Is there any solution?
Thank you very much.

Hi. Try doing a safe boot. Press the Shift button while turning on the computer. If you encounter the same issue, boot from the install disk (insert the disk that came with your computer and boot your computer while holding the C key) and repair the disk and disk permissions. Hope this helps

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