looking for connecting the cyberpower pc to monitor

[chakrabortyc]

my cyberpower computer is attached to the monitor through hdmi cable, but the screen says "no signal". Do I need a signal cable or DVI?

 

[USAFRet]

my cyberpower computer is attached to the monitor through hdmi cable, but the screen says "no signal". Do I need a signal cable or DVI?

Is the HDMI cable attached to the GPU port or to the motherboard port?