... fittings, rust, rot, heat elimination chassis.4) check internal and external connector of LCD display , Two memory, DVD driver, ... PC, 3.3V COMSbattery, Battery whether charge and discharge,Full running 3D, Restart system atleast two times.5) our testing link: ... guarantee 100% compatibility as there are several different system boards available for this seriesOur contact details as follows:Contac name: ...