Welcome to Seven Forums ST3PH3N. That wouldn't be a backlight problem. Does this only happen on the boot screen? Does it happen when you boot to Safe Mode?
If it does not happen in safe mode, it may be the GPU. But if it only happens on the boot screen, it may be an odd windows glitch, especially since you just reformatted. Try it in safe mode, and report back. Also confirm you do not see it at any other time.