Why doesn't the new ram memory for iMac (mid 2011) work (different brand)?

Hello,
I have an Macbook pro at home (early 2011) and an iMac (mid 2011).
My macbook pro had 2 x 2GB ram and I wanted it to be higher, zo I bought 2 x 4GB ram from Kingston. I installed it succesfully in the macbook pro.
I saw that the ram in my macbook and iMac where the same type (1333MHz DDR3), so I figured the Ram-modules were interchangable. The iMac has 2 x 4GB ram put in by Apple itself. It's a weird brand name, something Asian that I hadn't heard off.
I thought I could put the original ones from my macbook pro (brand Samsung) in with the original ones that where already in the iMac.
So the slots would look like:
4GB          4GB -> already in iMac, original modules with brand name I can't remember ;-).
2GB          2GB -> original modules from macbook pro Samsung
I also put in in like shown: the same types next to eachother.
Then I turned my iMac on and it only "beeped".
So I tried to put it in different combinations (4GB next to 2GB etc etc). But it still "beeped".
Very frustrating... because I thought I was doing a good thing by buying Kingston (quite expensive also...).
Now I think I had better purchased new 2 x 4GB Samsung and combined that with the 2 x 2GB Samsung from the macbook and put it all in the iMac. And take those of the iMac (2 x 4GB Asian brand) and put those in the macbook... This way it were all the same brands combined...
But I did by Kingston... so... why can't I combine the original iMac ram modules with the Samung modules from the macbook????? I've read that in older iMac models, the slots are sensitive for different brands, but couldn't find out for sure for my iMac (mid 2011). It's a bit stupid, no... Both mac's are from 2011 and have the same specifications...
Could anyone give me an answer?
A little bit mad at Mac right now ;-).
Thanks in advance!
Wallking.
PS: if it is about the OSX I'm using... can't update to Maverick for software licence reasons... I need the iMac for work a lot...

Hello,
I'm sorry if it wasn't clear... but I don't have ram issues with the Kingston type...
I used the new Kinsgtons in my macbook and wanted to take the originals from the macbook (Samsung) and them put in my iMac next to the other modules that were already in the iMac.
I know it's a bit confusing... ;-)
So... I have 2 x 4gb in my iMac from a brand I can't remember the name off... And I also wanted to put in 2 x 2 GB Samsung modules. So that would count up to 12 GB ram. Why? Because I took the Samsung modules out of my macbook and I thought I could reuse them in my iMac since they have the same specifications (1333MHz DDR3). But My iMac won't start up as soon as I insert those 2 Samsung modules.

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