Put an anti­static wrist strap on your non­dominant wrist (if you are right handed, put it on your left wrist) and connect the metal clip to the metal edge on the inside of the computer case

Locate the power supply

Follow all of the cords leading away from the power supply and unplug all of the power connectors

Check that all power cords are free from any clips or brackets in the case

Unscrew the power supply from the outside rear of the case

Press the blue tab behind the power supply and remove the power supply from the case

Check the computer expansion slots

If there is a graphics card, remove the retaining hardware at the back of the case to show the edges of the expansion card slots on the case

Locate the small tab behind the card at the edge of the slot

Press and hold the tab away from the slot, and gently pull the card outwards from the slot

Remove the graphics card from the case and set safely aside

Replace the retaining hardware at the back of the case to hide the edges of the expansion card slots on the case

Locate any optical drives (CD or DVD drives)

Unplug the data cable connecting the optical drive to the motherboard at the drive (the cable should still be connected to the motherboard)

Slide the blue bracket the direction the arrow on the bracket shows to release the plastic on the front of the computer and carefully remove

Slide the blue bracket again and remove the optical drive from the computer case through the front

Disconnect the data cable from the motherboard that attached to the optical drive and place it with the optical drive

Locate any hard drives

Unplug the data cable connecting the hard drive to the motherboard at the drive (the cable should still be connected to the motherboard)

Remove the hard drive from the computer case

Disconnect the data cable from the motherboard that attached to the hard drive and place it with the hard drive

Take note of how many sticks of RAM are installed on the motherboard and in which RAM slots the stick(s) are installed