I have a Aorus B450 Elite motherboard. I've tried both the Nvidia Geforce GT740 SC and Radeon RX 550 GPU's and still "no signal" check connections message on my Samsung TV. It use to work fine but now "no signal." I've tried different HDMI cables and GPU's. What else could it be? Something on the motherboard? Motherboard is brand new and everything powers up just no video. I've also tried different cables and TV's. Still same,"no signal," message. I even tried the DVI connection. What could else could it be? Or did I just get a bad motherboard?