Intel Based IMac OS X 10.5.8 freeze on shut down and hang ups

Have an Intel IMac8,1 OS X 10.5.8
Computer has been freezing up on shut down, will log out and hold right at the shut down screen with a loading icon running. Will have to force shut down with power button. Applications have been loading slower than usual and computer hangs up frequently. IMac has been offline(no internet connection) for about 6-7 months, reconnected recently.
Have updated all recommended updates, would my outdated operating system be the problem? Not sure if during the time of being offline, important updates/firmware I might need? Should I update my OS X or is their a fix/update that will work?
Read a post about verifying permissions...?
Any help would be greatly appreciated!

would my outdated operating system be the problem?
Nope, something else.
Could be many things, we should start with this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
Then see how many of these you can answer...
See if the Disk is issuing any S.M.A.R.T errors in Disk Utility...
http://support.apple.com/kb/PH7029
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
Open Console in Utilities & see if there are any clues or repeating messages when this happens.
In the Memory tab, are there a lot of Pageouts?

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a brody - Using a second Mac as a display for a first
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My 20" 2.16 GHz Intel Core 2 Duo had become almost useless due to freezes and crashes- with NO crash reports in the logs.
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http://www.derman.com/iMac-Fan-Control
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Intel Based IMac OS X 10.5.8 freeze on shut down and hang ups

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