I have an Acer laptop with an intel Graphics HD 520. i have 3 monitors (laptop and 2 Dells) but the 3rd monitor is not being detected. How can I fix this?
Are you sure your laptop was designed to support two external monitors being connected? I would check Acer's specification carefully or contact their support folks for clarification.
Also, a little more information would help. What laptop model? What monitors are you trying to connect? How are you trying to connect them?