I have an HP Envy laptop that I needed to replace the lcd on. I needed to buy a replacement LCD and the back cover since the damage broke the hinge mounting on the cover. I had to switch over the wifi antennas to the new back cover. The replacement touch screen works fine with 1 exception. When the laptop lid is closed the laptop does not go to sleep. I checked all cables and made sure they were not damaged and all secure. I checked windows and the laptop is set to sleep if the lid is closed. I am thinking there must be a switch somewhere in the laptop screen or cover that is not working. Anyone have suggestions?