Re: Just built my first PC and no image comes up on monitor.
Heat is a pretty typical cause for the shutting down, though sometimes it causes BSOD. I can't think of any other reason in my experiences for it doing this.
The heat up and cool down times are both very quick; it can heat up very fast (especially the 65nm quad series) and dissapate its own heat fast, too. What thermal compound are you using? and is the Core stock clocked?
RD-PC -//- i7 950 // Evga x58 SLI // 3x2 OCZ PC3-12800 // 2x Evga GTX470 // Corsair HX850 // SilverStone TJ07