I have a w2228h 23in hp monitor (FN747AA) and when. I plug it in the computer to the monitor i don't use hdmi it's the other cord with the pins. VGA. It used to work fine but now when I turn it on the screen appears and shows my desktop but then goes black also I used to take turns using the same VGA cord for both my desktops and one day one screen had a red line and green on the right of the desktop and anywhere else. Help me fix this. If I use a hdmi will that solve the problem, I think the VGA input spot is messed up.help?