My computer has worked perfectly fine until now. A few days ago it would go into boot loops where it would turn on for just a second. I figured out that the PSU was the problem. After getting a new one, I installed it, and powered up. The computer, lights, fans, and all powered on for 10 seconds without any display, and proceeded to shut off. Five seconds later, it would repeat this process. I tested the power supply, and it's all good. What exactly does this look like to you guys?