I was just overclocking my gigabyte r9 380 and I set the overclock and my screen is black. I cant turn off the system or do anything on it. Its been like this for 10 minutes so far. I didn't touch the voltage on it. It was blinking black after overclocking before and I should have stopped there probably but I thought it was normal because it was happening even at low increases such as 10mhz. I haven't tried plugging the HDMI port into the Motherboard instead of the GPU but I don't want to damage anything. Is that safe to do?