Hi I recently bought Dahua NVR model no 4108HS. I was changing the screen resolution somehow I changed the monitor resolution and the monitor doesn"t support that resolution. Now my monitor screen is blank. I even tried to hook it up with the HDMI as well but no success. I have read about doing hard reset from the motherboard but motherboard does not have the hard reset switch. Can somebody help me to get the screen back. I am able to see the cameras from mobile device.