Mixing RAM sizes and issues

I'm having an issue with my late 2012 iMac 27 inch. It came with 8GB stock RAM installed on the 1st and 3rd slots (lookin from bottom to top). The 2nd and 4th were empty. I bought a Crucial 16GB RAM (http://www.amazon.com/Crucial-PC3-12800-204-Pin-Modules-CT2C8G3S160BM/dp/B008LTB JFW/ref=sr_1_1?ie=UTF8&qid=1365482251&sr=8-1). I installed the new ones in 2nd and 4th slots. Much to my surprise, when I switched on the machine and checked "About my Mac", it only showed 16B 1600Mhz RAM instead of 24GB RAM and after a few seconds, the system hung. I restarted the machine and I heard several beep sounds and the system never turned on. I checked th slots and all were seated OK. On switching again, I heard the same beeps. I switched off the machine completely, waited for a few seconds and tried again and then all was normal. The system was showing 24GB RAM and I was able to use my system for couple of hours and all was OK.
I have couple of questions:
1. What's going on here?. Is it a bad RAM that I need to worry about?. I still have ample time to order a new set of RAM and return the ones I have now.
2. Why the system acted up and now it is OK even though I didn't change anything?
3. Is the seating correct?. What is the best order to get maximum performance?. I intend to remove a 4GB RAM and keep it at 20GB RAM. If that's the case, what should be the order of arrangement?
4. Is there any cause of concern that my system is acting up?. I'm well within my 14 day return period and I can go for a exchange if you guys feel that way.
Please advise.
Thanks.

Sounds like maybe the modules are not firmly seated in the slots.
Try re-seating them, only this time push real hard on each module with both thumbs to ensure that than are firmly seated in the slots.
see > iMac: How to remove or install memory
Then if the new RAM is not working, return it and buy directly from > Crucial.com or > OWC macsales.com

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The difference between RAM size and processor spee...

since both the size of RAM and
CPU's processing speed are said to be the
determinant factors of the phone's
performance(usually speed wise),what exactly is the
differece achived on the phone 1) by increasing
the size of RAM,
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Solved!
Go to Solution.

dawitbogale wrote:
since both the size of RAM and
CPU's processing speed are said to be the
determinant factors of the phone's
performance(usually speed wise),what exactly is the
differece achived on the phone 1) by increasing
the size of RAM,
2) by Upgrading
the CPU's processing speed on
the phone, separately? Can one of them be a
substiute for the other? (is it
possible to say 2 type of phones,
eg. one with low RAM and high
MHZ/s, the other with big RAM
and low MHZ/s, are
approximately equal in terms of
performance???
1.
The device with larger ram can open more applications compared to the device with less ram.
2.
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Low speed processor with high ram can run many apps but execute apps slower.
Hope you got the idea.
-------------------If this post helped you, click on accept as solution.------------------
-----------------------------Appreciate by clicking on white star.----------------------------

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