I used to be able to write the minute I sat down in front of the computer, but that changed once I started playing music on the computer. (Youtube was a dream-come true. hehe.) Once I find a certain song that sets the mood of the story, I tend to type every single chapter, bit-by-bit, while I listen to it, associating that particular song or group with the story. I find it very difficult to write when I try so very hard to think what to write; sort of like I can't concentrate if I push myself to concentrate. Well, anyway, music is my trick.