I had OSX Yosemite Beta installed on my 27" mid 2009 iMac and the video card died. Just was wondering if there is any chance that software can damage hardware like this. Just looking for an honest answer. I liked Yosemite, found it very stable, my machine ran very moth and seemed a quicker. Just don't want to put it back on if it can cause hardware issues. Thank you for any help or advice.