Monitor sometimes cant find signal from PC

I think this is a BIOS problem but im not sure
My specs are: Windows 10 Intel i7-2600
CPU 3.40GHz
8bg Ram
NVIDIA GeForce GTX 960
Antec VP700P 700w PSU
hp Pavilion 23cw Monitor

Ok so sometimes when i turn my computer on the monitor will wake up but cant find any signal from the hdmi cord, i have tried with an RGB and DVI cord as well but same problem. The monitor works fine if i boot it with the onboard graphics though. This problem doesnt happen always, half the time it will boot fine with the monitor finding the signal from my graphics card but other times it wont. Sometimes it will boot fine but after a while the monitor will just go black and say it cant find a signal and i will have to restart my pc and hope it finds it when i reboots.

Any ideas?