HP ProBook 4540S 15.6" Standard USED Laptop - Intel Core i3 3110M 3rd Gen 2.4 GHz 6GB SODIMM DDR3 SATA 2.5" 320GB HDD DVD-RW Windows 10 Home 64-Bit - Walmart.com
How to disassemble HP ProBook 4540s – Inside my laptop
HP ProBook 4540S 15.6" Laptop LCD LED HD Screen Matte 40 pin N156B6-L0A Rev.C3
HP Probook 4540s - Replacement WIFI Guide with AR9280 Atheros | tonymacx86.com