Ok I lost my power supply to my s232hl acer monitor several weeks ago. I just got a 19v replacement power supply for it. I plug it in and it wouldn't detect my VGA input, so I try my extra VGA cable plus 2 different HDMI cords. My monitor still won't detect a signal. What am I doing wrong here? By the way there is only one VGA and one HDMI port on my desktop.