Hi, my system is detailed in my signature. My iMac has worked flawlessly since it was new (probably about 2 years or so) until now. When I bring it back from sleep mode, within a few seconds, I get the spinning pinwheel. At first, it would come out of it in a couple minutes. After a few days of this, it now does not come out of the lockup at all. I'm not sure if can force-quit or not because I just remembered that tool so I was just turning it off by holding down the power button. I rarely have time to devote to computer troubleshooting (which is why I bought an iMac) but I plan on digging into this over the weekend. Any helpful advice would be much appreciated. I'm not exactly a computer guy so I could use all the help I can get! The only new software that I have added recently is the software for my new Harmone One remote control. But even when I have "quit" that application, it still happens. It did come up okay once and the only apps running were Firefox and Finder. Next, I had those 2 open + Mail and it froze but I've only ran that test once so I'm not sure if it's a pattern connected to Mail yet...or not. It has been in and out of sleep mode 100's of times w/o issue before this started happening and it never mattered what apps were on or off. Hope you can help!