"Do you read what a thread says before you post? I posted a question in general hardware a few days ago, and it looks to me like only one person actually read what I had posted... a little annoying if you ask me. Anyways back to the question, how often do you read the first post in the thread, or how far down do you read in the thread?"
It depends upon the situation. Most of the time, I read the entire thread or almost all before posting. However, there are times I just post without reading past the original post and maybe two posts below. In those cases, I am either in a hurry, the thread is lame or the posts consist of meaningless contents also known as "neffing" and doesn't merit reading the posts.