I think putting the motherboard in is the most complicated and delicate thing. If you screw a single screw too tight, it could crack it (even the slightest crack could make something not work. I found out the hard way >_> Very slightly cracked it at the edge where the graphics cards and stuff are, and the pc would not read the monitor. It acted like the monitor wasn't plugged in at all.) and you'd have to buy a new one and the damn things are expensive!