I installed a 120GB OWC Mercury Extreme Pro SSD in my 27" mid-2010 iMac. If I allow the iMac to sleep on it's own, after I wake it, it will show a constant beach ball and then freeze up. If I manually put it to sleep, it does not freeze up. I previously had this same SSD in my mid-2009 macbook pro with no freezing issues. I have read that my SSD has the older firmware on it. There is apparently a newer firmware that fixes a hibernation issue and OWC's website also mentions sending the drive in to fix the sleep issue. I bought my OWC SSD in Nov 2010. I emailed OWC tech support and their response was to do a clean install. I immediately replied and told them I had done a clean install already. I am waiting for a response from OWC. I am disappointed with OWC's response to a problem that they seem to be aware of. Has anyone else experienced this freeze after sleep issue in their mid-2010 iMac or any other iMac? Has anyone resolved this issue?