Hi, I was surfing the net and out of a sudden my monitor went blank and gives out a notice saying " no input signal ". But after rebooting pc, everything is fine? 
I'm wondering if it is the GPU or the MONITOR that is causing this? And yes I have checked the cable connection, they are fine and not loose.

I'm wondering if it is the GPU or the MONITOR that is causing this? And yes I have checked the cable connection, they are fine and not loose.