To open the Mac Pro, you'll have to lift the clip on the back of the case

Lift the flap to put it in the unlocked position, the panel should separate from the box without forcing.

Then to remove the hard drives, pull them towards you with a bit of force.

Pull the DVD drives towards you, just like the hard drives.

Press both latches to unlock the bracket and then pull it towards you.

Remove the 6 or 8 pin connector from your graphics card.

On the power supply there is a button, press it to move the power supply to the left (see picture)

Then pull the graphics card towards you to take it out of the box

Disconnect the PCI-e cables from the motherboard

With a screwdriver unscrew the two screws that hold the fan bracket to the board

Pull the fan towards you

Behind the fan bracket there are 2 SATA cables, a 4 pin mini power supply and a 4 pin fan

With a H2.5 screwdriver, unscrew the screws on the bottom of the bracket (photo 2)

With a Phillips screwdriver, unscrew the screws on the bottom of the case (photo 3)

Remove the clip at the top of the fan

Pull on the top of the fan a bit.

Similar to the top remove the clip at the bottom and pull out the fan.

Disconnect the 2 x 4pin fan cables and the 1 x 2 pin speaker cable

Pull the CPU support towards you

Remove the ribbon that connects the motherboard to the expansion card (USB, Jack, Power Off etc.)

Unscrew the 6 screws that hold the card in place.

unscrew the two screws and remove the cover

Push on both knobs to remove the power connector

Unscrew the 4 screws that hold in the power supply

Pull the power supply towards you.

Unclip the bluetooth antenna

Unscrew the 10 screws holding in the motherboard

Follow the steps in reverse to resemble.