Intel Mac :: Disk Utility Cannot Repair Disk

Apr 1, 2012

I'm experiencing some problems with my iMac right now, and I'm not sure how they started or what to do to correct them.  

1) Computer seems to hang up from time to time while starting applications, or in the middle of some tasks. There's no rhyme or reason or any patterns.

Question: Is there anything I should try to clean up the computer? 

2) About a week ago I started using Time Machine to do scheduled backups rather than me manually starting my own backups. Now whenever time machine does a back up, it seems to stop working somewhere in the "Preparing to Backup" stage, and I end up needing to restart the computer manually because the whole system becomes useless. It will no longer complete any backups, even when I start manually.

Question: Why would time machine now all of the sudden start freezing in the middle of the prep to backup stage? 

3) I just tried to use my disk utility to check and see if I need to repair the disk and here is what reported back:
 
Info:
20" iMac, Mac OS X (10.5.8), 2.4 GHz Intel Core 2 Duo

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