I replaced my old motherboard and cpu and i have put them inside of my pc and everything is connected properly and has been checked multiple times , my pc starts up and the cpu cooler spins aswell as my power supply and the led starts on my motherboard but my samsung monitor switches its self onto standby mode , i have tried using a hdmi aswell as a vga but nothing is allowing me to get any display, please could you let me know if you have any idea , thankyou