well i bought a powersupply and a gpu. I opened my current computer up and took out my current powersupply. I installed my gpu in my case and i went o turn everything on. nothing happens. my computer turns on but my screen doesnt show anything. when i installed my new powersupply I noticed there was not a four pin plug but there was on my old power supply, and it was plugged into my motherboard beside my cpu. I can answer more questions, im frusterated and scared. if anyone could help me please. or attempt at finding out whats wrong.