Everything was great untill I removed the graphics card to check the model number...stupid thing to do as now after putting it back in I have nothing on screen, no post, nothing infact the screen goes into energy save mode, the motherboard gives 1 long and 3 short beeps, which I'm led to believe is a graphics failier. I have swapped card with a known working card and still no screen and the same beeps, the card works in another PC ok, so it looks like I have stuffed the motherboard.....am I missing an easy solution here or should I just swap out the M4N78SE and put it down to being an idiot?