What is the product number of this computer? (Ensure you do not share any of your personal information such as serial, phone number, email ID, etc.) To provide you with an accurate solution, I'll need a few more details: Don't worry I'll try my best to help you with this, I see from the post that you want to know how to disable laptop screen while using an external monitor. It is a great place to find the help you need, from other users, HP experts, and other support personnel. For you to have the best experience on the HP forum, you could also visit our HP Forums Guide for the First Time Here? Learn How to Post and More. Hi you for showing your interest in HP Support Forums.