Ok there are two rear case fans on my computer. Im not sure what type they are, but they are blue led fans. The bottom one works fine most of the time, sometimes it wont move at all, but itll usually starts going at the right speed after that. Then my other one, it stops dead usually, and i have to open the window and give it a spin for it to start, and it goes a lot slower than the other fan does. So slow the led in the center doesnt turn on, it doesnt put air out the back. What do you think the problem is and how do you fix it?