Hello, everybody! First-time builder here, and I have a problem. I have assembled all the parts of my computer so that the fans spin and lights light up properly, but when I plug the d-sub display into my monitor and into the mobo I get no signal. I'm running an ASRock FM2A88M PRO 3+ mobo, a Gigabyte R9 270X Windforce Edition gpu, an AMD Athlon X4 860K cpu, 8 gb of RAM, and an ARC 750w 80+ bronze PSU. Any ideas why I'm not getting display, but my system is running on the inside?