Hi Vince,
According to the iFixit site for the 27" iMac 2009 model, there are 3 screws to
the compartment door, and you use a Phillips #1 size screwdriver to open it.
I'll paste in the text of their instructions and then give you the link to the
page:
<begin quote>
Step 1 — Access Door
Loosen the three Phillips screws securing the
access door to the bottom edge of your iMac.
These screws will remain captive in the access door.
Remove the access door from your iMac.
During reassembly, fasten the access door loosely and align
it with the pocket cut into the outer case of the iMac before fully tightening
the screws.
Step 2 — RAM
Use your fingers or the tip of a spudger to slide the
black plastic RAM tray pull tab out of the RAM slot.
Step 3
Pull the black plastic tab away from the iMac to eject the RAM
chip from its socket.
Use your fingers to slide the RAM chip(s) out of its socket.
If necessary, repeat this process for the other RAM chip(s).
<end quote>
The "spudger", by the way, is just a thin stick with a pointed tip that is
electro-statically protected. You don't need it, but you can use the end to
help tease out components.
Source: "Installing iMac Intel 27" RAM - iFixit"
http://www.ifixit.com/Guide/Repair/Installing-iMac-Intel-27-Inch-RAM/1630/1
The iFixit folks are the people who do teardowns of new products. They
typically give instructions for accessing components that are difficult for
most people to get to, so I figured they would also cover the easier to access
components with a set of instructions, and did a Google Search. HTH. I don't
know why you can't get at the that third screw, though.
Cheers,
Esther
On Jun 10, 2011, at 09:52, Vince Mistretta wrote:
> Ester,
>
> I'm not even at that step. It's the compartment door I'm referring to. It
> is sticking in the center and I can't seem to get it loosened up.
>
> In the center there seems to be a very small item loosely moving in and out
> when I move my fingers over the area, but can't figure if it's something
> which requires a pen or paperclip to press it in.
>
> It's definitely not another screw.
>
> On Jun 10, 2011, at 3:42 PM, Esther wrote:
>
>> Hi Vince,
>>
>> Just after the step about removing the screws, the instructions on the
>> Apple Knowledge Base article page say:
>>
>> "Untuck the tab in the memory compartment. If you are replacing a memory
>> module, gently pull the tab to eject any installed memory module."
>>
>> Did you try to feel around for any tabs along the base of the compartment
>> and pull them out? I'd guess from previous memory setups that you're up
>> against the actual modules, which you have to pull out by finding the tabs
>> tucked below them. Try to locate the tabs and then try pulling them out.
>> Just guessing from the instruction list description.
>>
>> Cheers,
>>
>> Esther
>>
>> On Jun 10, 2011, at 09:26, Vince Mistretta wrote:
>>
>>> Thanks, but I did that and it says to remove screws - not how many for my
>>> model. Most 27 inch seem to have two screws which Idid loosen, but there
>>> seems to be something else there which is not described. It might be in a
>>> diagram, but not described in words. That's why I'm asking here in case
>>> anyone had this experience. I really don't want to bring this thing into
>>> the apple store just for this simple task.
>>> On Jun 10, 2011, at 3:10 PM, Esther wrote:
>>>
>>>> Hi Vince,
>>>>
>>>> I don't know the iMac layout, but Apple's support pages gives full
>>>> information on how to perform memory upgrades and disk installations (on
>>>> computer and laptop models where this is relatively easy to access). Go
>>>> to the Knowledge Base Article on "iMac: How to remove or install memory":
>>>> http://support.apple.com/kb/HT1423
>> <snip>
>>>>>>
>>>>>> Is there more than two screws on bottom memory door? I loosened the two
>>>>>> screws on either side but find it still is being hindered by something in
>>>>>> the middle.
>>>>>
>>
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