IMac 24" freezes on boot about 50% of the time

My iMac freezes on bootup about 50% of the time. The freeze occurs prior to getting to the login password screen (the screen is blue when the Mac freezes). Holding down the power button to hard-shutdown the Mac works, and then typically on the next boot, the Mac does not freeze. I noticed that when it does finally finish booting correctly, the Boot Camp partitioned drive takes a long time restore to the desktop ... about a solid minute or two longer than when Finder finishes loading.
The problem has been going on for months, but seems to be getting worse. Using Disk Utility identifies NO errors on either the Mac or Windows boot partitions.
I have the OS up to date with all the latest patches.

HI David,
Go to System Preferences/Account. Click: Login Items. If you have applications listed there to launch on boot, for now, delete them and reboot and see if that makes a difference.
Try maintenance. Mac OS X: How to force background maintenance tasks (logs and temporary items)
Go to System Preferences/Software Updates. Click Scheduled Check then click: Check Now
Make sure your Mac software is up to date. If you install and updates, make sure and run Disk Utility and Repair Disk Permissions after the updates are installed. Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select FirstAid, then click: Repair Disk Permissions. Quit DU when it's finished and reboot.
How much available disk space is there? Right or control click the MacintoshHD icon on your Desktop, then click: Get Info. In the Get Info window, click the discovery triangle so it's facing down. You will see; Capacity and Available Make sure you have 10% available disk space, 15% is better. Insufficient available space, can cause performance issues, system corruption, and possible loss of data. Not enough available disk space can slow a drive down considerably.
Carolyn

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