HP Elitebook 840 G1 Motherboard Replacement - iFixit Repair Guide
Amazon.com: HP EliteBook 840 G1 14in HD+ TouchScreen Business Laptop Computer, Intel Dual Core i5-4200U up to 2.6GHz, 8GB RAM, 256GB SSD, USB 3.0, VGA, WiFi, RJ45, Windows 10 Professional (Renewed) : Electronics