Question PC running after power on but unable to start OS

[Brandtology]

What are the steps I can take to find out what’s causing my computer to stall after powering on?


I observed although the CPU is running....there’s no signals to the monitor and keyboard unresponsive.

 

[kurdtnz]

full system specs?

 

[SkyNetRising]

I observed although the CPU is running....there’s no signals to the monitor and keyboard unresponsive.

Did it work before?
Or you just assembled it?