have an older machine, an iMac 6.1 Model Name: iMac Model Identifier: iMac6.1 Processor Name: Intel Core 2 Duo Processor Speed: 2.33 GHz Number of Processors: 1 Total Number of Cores: 2 L2 Cache: 4 MB Memory: 3 GB Bus Speed: 667 MHz So a few months ago my 750 gb internal HD crashed. I had no backup (I know). I replaced it with a 1 TB internal HD. I reinstalled Leopard, then upgraded with my Snow Leopard disk. I didn't install SL directly cause I had the Leopard disk handy and wanted to get things moving. My original machine had been upgraded as well so I didn't think anything of it. I then installed and started working with all my various programs. Well now I am having a terrible problem with the computer freezing up. I get the spinning color wheel often, with the computer freezing completely (no curser or keyboard response either) nearly as often. The color wheel happens once every 8-10 minutes, and the complete lock up happens around every 20 min and last for a solid 50 seconds. I tried reformating the drive and restoring from a backup of time machine (now I'm backing regularly), but it persists. I'd format and reload everything again, but that's a very heavy process, and I have too many old files replaced to do this easily, and I'm not sure how to do partials quickly and efficiently off of time machine. I need this station for work and can't afford to upgrade it. The machine worked very well previously before the glitch. Any help with a fix to the problem? If this is a no go, any advice on cleaning/fixing, then replacing backups quickly and efficiently without importing the problem if it's a software issue? Thanks.