what to do if my red light on computer doesnt work

[Andrija_2]

I connet my motherboard it runs but monitor show no signal and red light on computer doesnt turn on

 

[Sammyjo201]

Do the fans start spinning? Are you using something like HDMI or are you using something different to connect it?

Have you made sure that all of the plugs in the motherboard from the PSU are plugged in firmly?