I have a r9 280 which works fine on VGA but my new ASUS VX239H has an HDMI input too, when I connect that with the PC using the HDMI cable provided monitor just turns on says "no signal HDMI" and goes on standby and screen turns black, it doesn't allow any mode selection or anything, it doesn't go in menu either, I assume iit's not getting a signal from the gpu since it is still giving signal to VGA? I know this because as soon as I connect the VGA the display comes on. So yeah how to make it work on HDMI?