So I got an early 2008 iMac which I have been using daily since the purchase. Even though I got a new MBP, I am still using it when I'm home. However, recently it started to restart for no reason. During usage, it would freeze and within a few seconds, the screen turns off and the computer automatically restarts. I could include a crash report next time it crashes. Does anyone had the same experience? What is it a sign of? Dying HDD? CPU?