Introduction
Remove your access door to replace RAM chips or to open the case of your iMac.
Tools
- 
                  
                  - 
            Lay your iMac front side down on a table with the lower edge facing yourself. 
- 
            Loosen the single Phillips screw in the center of the access door. 
- 
            Remove the access door from your iMac. 
 
- 
            
                            
                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
The grid won't fall off by itself. You'll have to help it. Use the smallest screwdriver you have; the Torx 6 worked fine for me. It should enter in one of the many holes composing the grid. Use it as a lever to ploy the grid a little bit. You may catch it with your fingers and that's it.
Be carefull not to damage the hole by a too strong leverage.
Laurent -
much more safer to use duct tape, instead of torx 6. (glue it along the length of the grid and pull). it will loose instantly and smooth;)
Hofmann78rus -
Anyone know a guide to replace the plastic piece this screw connects to? I accidentally forgot this step - went to remove the front bezel and bent the plastic piece the access door connects to.
Jason Augustin -