The last machine I built was for my cousin. She has reported that when she switches her machine on from cold, the monitor powers up, but there is no display, just a blank screen. She then hits the restart button, and the display appears and all is well. This happens every time she switches on from cold. She also had an isolated incident where her screen went blank while playing a game (Harry Potter), and as I think I mentioned once before, some plain text has a slight, but noticable, 'ghosting' effect.
Any ideas? My first thoughts are a fault with the Graphics Card.