Brief but frequent freezes

My iMac is 5 months old. A couple of months ago it started to "sieze up" every now and then, and only for a few seconds at a time. No color wheel shows up. Commands just aren't executed, such as scrolling through a web page or typing. There doesn't seem to be any regularity to when this happens, and it can go on for minutes or it can go on for hours.
At its worst, it's really a productivity killer. The constant interruptions wreak havoc on my workflow.
Any suggestions?
FYI, I tried a disk repair. Diagnosis is, all is well with the hard drive. I usually leave my computer on so I tried rebooting, but that didn't work either.
Any suggestions?
Thanks.

HI,
My iMac is 5 months old. A couple of months ago it started to "sieze up" every now and then, and only for a few seconds at a time.
Just in case, make sure all your important data is backed up.
Might be a good idea to run the Apple Hardware Test
Try starting up in Safe Mode. Hold the Shift key as your Mac starts up. Starting up in Safe Mode can take a little longer then a normal boot. After your iMac has booted into Safe Mode go to the Apple Menu and click Restart. See if the problem persists.
Try Resetting the PRAM
My iMac is 5 months old.
If you transferred files from a previous PowerPC Mac to your newer Intel based iMac using the Migration Assistant, that could account for the random freezes. To see if you have apps that require Rosetta, go here; Intel-based Mac: How to tell if an application is Universal
Make sure there is always enough free disk space. Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. *Make sure you always have a minimum of 10% to 15% free disk space at all times.*
Carolyn

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