System turns on, but won't appear on monitor and after I tell it to shutdown, it restarts

DLXGP7

Honorable
Jan 7, 2015
8
0
10,510
Hello
After some days of using my newly built pc, I found out my case's front headphone and microphone jacks didn't work, so Iooked for the cable, eventually found it and connected it were its supposed to go on the motherboard. After finally having this jacks working, and after some time, I turned my PC off.
Sometime later, I tried to turn it on, but nothing seemed to appear on my monitor, so I turned it off. 5 seconds later and it restarted by itself. So I turn it off and immediately disconnected it from the power outlet. I tested the monitor with my console and everything worked fine, even with the same HDMI cable. Now every time I try to turn it off it reboots and doesn't show anything up on the monitor, and this is frustrating. I need help please. Everything turns on fine, even the fans and lights inside my PC
Much help is appreciated and thanks.