So what I gather is that you now cannot start your computer up at all, due to this issue. I'm actually unsure of the problem, it sounds to me like a Virus has been at your computer. It can't really be a hardware issue I don't think... I mean it is possible that what could have been happening is that your computer (Desktop or Laptop?) is overheating and its been damaged because of that... But that wouldn't really make sense, and also having Custom Built a computer I'm sure you'd have been smart enough to install a thoroughly capable cooling system.
It sounds to me like your hard drive has been corrupted though, BSOD usually means a pretty big issue. Thats why I was thinking hardware problem to begin with, you don't often get it for Virus's.
A couple of things we need to know:
Do you have any sort of Anti-Virus installed? If so, which one? How frequently did it scan? Did you find any virus's?
Also, how far into the boot process does the computer get before it loops? Are you able to enter BIOS settings before Blue Screen comes up and it loops? What happens when it loops?
And do you have a startup / boot disk for your computer. You certainly should do.