My system won't shut down

I have a 2.1GHz PowerPC G5 with OS X10.4.8 which is 16 month old. It worked fine until yesterday. Now It acts wierd in the following two ways:
First, the computer system won't shut down. When I click on Shut Down Button on the Screen, it won't shut down. Instead the screen shows the clock for ever unless I shut it down manually by pressing the Start button at the back of the computer.
Second, when I click on Software Update, it shows "Checking for new software..." window forever with the progress bar stuck at about one fifth.
Does any of you have a solution to these problems?

Welcome to the discussions.
http://discussions.apple.com/thread.jspa?threadID=122021
First I would repair permissions.
http://discussions.apple.com/thread.jspa?threadID=196761
Cheers Don

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  • Finder Quits/ CPU won't shut down

    When i try to shut down the computer it quits the finder app. and says something has timed out and it won't shut down all it does is quit the finder app.

    OK. That's not good. Suggests that the problem is with the system. Sometimes this is caused by a bad cache or log file but it's hard to tell. The next thing to try, then, is to use a utility such as Snow Leopard Cache Cleaner or similar utility - CNet Downloads or MacUpdate - to clear out system, user, and font cache files. You should also repair the hard drive just to be sure:
    Repair the Hard Drive and Permissions
    Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
    If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
    Also, open the Console utility in your Utilities folder and see if there are any console messages around the time of your last shutdown/restart that might indicate what failed to quit.

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