Problem with starting the computer.
The CPU cooler and the PC are powering up when all the lights turn on, yet it doesn’t start and I’m unsure why everything is connected correctly.
You recently installed a new CPU cooler, but the system is not booting despite lights being on. You've checked all possible issues.
Likely nothing much happened, but you might have dropped something—try reinstalling RAM or GPU.
No, I didn't plug in the CPU fan.
Could this issue prevent the system from starting?