Hi! I was running the POST for my first pc build, and on the first startup around everything worked beautifully, with the exception of my graphics card, which was not plugged in. Obviously, I ran a power cable from it to the power supply and reattempted a start. Now, the red CPU error LED on the motherboard consistently lights up, and the CPU fans do not run. I have checked all of my power cable connections to both the motherboard and the power supply, tried an 8 pin and 2 4 pin power connectors, unplugged and double checked the CPU fan plug, reseated the graphics card, reseated the RAM sticks and tried booting without them (the yellow RAM error LED came on until I reinserted them, and then the red CPR error LED came back on), checked and redid the thermal paste, checked the CPU for bent pins and reinstalled it, and reseated the CPU cooler. I also tried running the post without the graphics card installed at all, and received the same CPU error light. The motherboard is not installed in the case and is resting on top of the box it came in, and I ground myself often on the power supply. What else should I try? I'm so confused as to why it worked only once. Thanks so much!