... 14.0-inch displays. P/N: 599522-001 Laptop motherboard for HP ProBook 4421s Series Motherboard 599522-001 IMPORTANT TECH NOTE ... rust, rot, heat elimination chassis.4. check internal and external connector of LCD display , Two memory, DVD driver, Network connection, ... Voice, Mouse, Keyboard, Dial, USB, SD connector, PC, 3.3V COMS battery, Battery whether charge and discharge ...