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 case without force.

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

Simply pull the DVD drive bracket towards you, just like with the hard drives. Force it gently.

Press both latches to unlocket the bracket.

Then, pull it towards you.

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

On the fan bracket, there is something like a button. Press it to move the support to the left (see picture)

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

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 (to move it away from the case)

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.

As with the top, remove the clip at the bottom and pull out the fan.

Disconnect the 2 x 4 pin 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 5 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 for reassembly!