new pc doesnt show anything on the screen
I have built a gaming pc al the parts work but theres problem. When i turn on the it stays on for like a few seconds and turns off and turns back on by it self and then it stays on but it doesnt display anything on the screen. When its on i see all the parts running like the cpu, gpu, internal fan, cd drive but it wont show anything on the screen. I have connected it to the monitor using a hdmi cable. Can someone help me out please for why it turns off and on and show no display.