I received my iMac 5k this afternoon. Within about four hours of heavy usage (setting everything up on it) it's crashed and hard restarted three times. Compared to this, I can't remember the last time that my 3 year old MacBook Pro crashed! Unfortunately I couldn't pinpoint any particular trigger for these crashes... I'll try to be a bit more conscious when they happen next and see if I can tell what may be causing them. Besides this though, I've also found that Dota 2 crashes on launch. Unlike the crash I mentioned previously this doesn't reboot the whole system, but still, it's very inconvenient! EDIT This was just due to some corrupt files I guess. After reinstalling Dota 2 it works great! My iMac's specs are: - i7 4.0GHz - 512GB SSD - 395X 4GB GPU - 8GB RAM (planning to upgrade to 16GB later) Have any of you had similar problems with your new iMacs, or do you think this is something over which I should ask for a replacement? Thanks!