What are you doing when it freezes? Watching a program? Transferring a program? What? We need some more info so we can help you out.
If it is freezing or pixelating, it is most likely the hard drive. If nothing else, you should get a backup of your drive before it fails, so you can load up a new drive.
If it is freezing or pixelating, it is most likely the hard drive. If nothing else, you should get a backup of your drive before it fails, so you can load up a new drive.