Step 1 — Dell Optiplex GX620 Side Panel Disassembly
With the computer standing upright,
firmly pull on the tab at the back of
the computer.
When the side panel pops free,
gently pull the panel away from the
computer.
If you have trouble freeing the side
panel from the case, you may need
to pull the tab a bit harder.
Step 2 — Now unplug your hard drives power and data cables.
Move the cables out of your way.
SATA Power
SATA Data