My computer screen froze but the sound still worked. I was talking to a friend on skype and that didn't freeze. I hard rebooted my computer and the monitor cycled through the connections, said no input on the screen, then went back to sleep. I switched to the motherboard's HDMI slot and it works. I checked the windows devices and it said that the video card is working properly. I just got this computer 4 months ago. My graphics card is a AMD Radeon R9 285 2GB. Any help is appreciated.