My Pc is not giving signal

Hi! Yesterday everything was working fine, I turned off my Pc to go to sleep, and now I wake up, wanna play some games, but...

​

My PC is turning on all the lights and fans.

The keyboard and mouse that usually turn their lights with the PC are not working.

The monitors are not receiving any signal.

​

I cleaned the PC with compressed air around 5 months ago, and, after the problem, cleaned the RAMs and the RAMs sockets.

​

Any idea? Ty