Strange problems with memory dimms(Banks) in imac 27in mid2010

Hello dear Apple community. I had a really strange problem with memory dimms(modules anyway)
I have one really good imac 27in with i7 but as you know after some years the lcd screen became yellowish and cloudy
So i decided to clean it as i have some knowledge and i did that to others lcd screens with success.
OK so after successfully cleaning and working like new ( i mean not the external screen with magnets but the lcd internally)i started it.
Before dismantling my memory was 16gb ( 4x4 dimms)
After starting it a strange problem arise without any reason! Memory reduced TO 8 GB!!!! memory banks on the right as we seeing it didnt worked at all
and it was not from dimms because i swapped them..!!!
So after a lot of thinking and asking tech guys to take a second opinion all the saying (including me that logic board failed for some strange reason.
Some days before i installed CCleaner and also Onyx because after a lot of installations and uninstallations my mac became a little sluggish..
I thought that some serious preferences files removed or some hardware settings deleted with Onyx ( is very good and powerful program that can fix the pc and also destroy it in a second) so i removed and reset all preferences. But nothing changed.. So i put a new hard drive and reinstall OXS to see if something can change.
After formating HD to appleHFS+ saw system profiler that still couldn't see all banks(16gb). I remove logic board and i put another processor i7 that i have as a back up and still nothing( some saying that only these 2 things must be faulty if memory banks not working , processor an logic board and sometimes reinsatlling OS can fix it as i mentioned before. But still nothing...
So from my nerves and after so much testings and no sleeping for 2 days as it was working i pulled off the memory modules from the right bank i put them again ( off course nothing changed) and i close it. After i restarted it like a miracle finally i saw that i have again 16gb in system profiler!!
Tech guys here please give me an explanation to this because i gooing crazy! What happened and after i pulled off the dimms while it was working the problem fixed?? It is not recomended at all this action. I forgot to mention that i did Apple hardware test and nothing found..
Sorry for long post.

Okay great news... My memory problems are solved and my Mac Mini is now running at 8 gigs of Ram. I tried the suggested DD3 1333 which the computer wouldn't even recognize.
So after visiting the Apple Store in the Fair Oaks VA shopping mall; they suggested that I try DDR3 8500 ram. I visited Micro Center in Vienna VA, and I purchased BGreg's Suggested Crucial Brand Ram. 10 minutes after I got home the Mac Mini booted on the 1st try with 8 gigs of Ram.
Some venting that Apple hopefully will read and mention to their resellers....
The people in the Apple section of MicroCenter in Vienna at first argued that the Mac Mini only supports 4 gigs. EVEN AFTER I SHOWED THEM THE SPECS on the Apple website. The clerk (who I am calling a clerk because by no means was he a "specialist") even suggested that the Apple site was wrong. On a later visit to MicroCenter to purchase the DDR3 8500, that the people at Apple recomended; Microcenter even suggested and argued that I needed DDR3 1333 and NOT DD3 8500. THIS WAS AFTER I TOLD THEM THAT Mac Mini WOULD NOT RECOGNIZE the DD3 1333 Dimms. Working in retail myself I don't go along with the concept that the customer is always right, however in this instance clearly I was.
I should point out that some of the staff in Microcenter really do try hard, however like with any business it only takes a few "know it all" bad examples to turn customers off.
Curious post thought; I wasted about $75 in gas driving to and from Microcenter because of their bad advice.

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