HP4540s Disassemble & Repair

Pull out the Battery
Remove the Back Cover
Remove the Screws
Take out the Hard Drive
Pull out the Ram Card
Remove the Cd Rom Drive
Remove the Heat Sink
Detach the Cooling Fan
Remove the WIFI Card
Remove the Keyboard
Remove the Processor Heat sink
Separate the back Housing
Remove the Touchpad
Remove the Fingerprint Sensor
Clean everything
Re-assemble the Laptop