installation steps: 1. Insert the DC/5V adapter into the KVM; 2. Plug the HDMI cable into the KVM and monitor; (HDMI Output) 3. Plug the HDMI cable and USB cable into the KVM and your computer/laptop (HDMI cables are not included) (Input) HDMI IN1 A + HDMI IN1 B + USB IN1=PC1 HDMI IN2 A + HDMI IN2 B + USB IN2=PC2 4. Insert the mouse and keyboard into the KVM switch 5. If needed, you can connect a microphone and audio port
Note: 1. Most of the reasons why only onevideo output works is because of incorrect connection. Please make sure eachcomputer have 2 HDMI cables connect to the KVM. 2. If the KVM switch does not work, you can turn off the switch on the panel and turn it on again after 2-3 seconds, and it will return to normal.