i just got done doing some research on this problem, and some one had the same blinking light problem and it turned out to be a usb port shorting out. Dont know if this is true or not but it cant hurt to try. Find the wire install the case that goes to you usb port on the front of your computer( if yours have one on the front) then trace that to the motherboard and unplug it and then try to boot the computer. Again i dont know how that can make a computer not cut on but some people have had that problem. So try that and then get back with me.
tj
tj