IMac won't boot OsX Partition after Bootcamp install/uninstall.

Hello,
I have bought 2 late 2012 21.5 iMacs last year and have used both the same way. Here is what happened with one of them recently.
Fisrt af all I've installed bootcamp 1 year ago in both iMacs without issues and was ok so far, and was using exclusively Windows 7 partition. The trouble iMac started with some startup issues during boot/reboot (screen was frozen with green/grey horizontal lines), but worked fine after following manual start up.
Lately I've been trying to boot from OsX partition and it freezes in the apple logo every time.
I have already done the SMC / PRAM procedures, without success.
I have tried to download and do a fresh OsX install (Mountain Lion, Mavericks and Yosemite). Can't boot from Mavericks / Yosemite flash drive install (both freeze at apple logo - horizontal lines), and only had partial success with one Mountain Lion 10.8.5 flash drive install that booted all right and the first part of the installation process was ok, but after the initial reboot, it happened to freeze the same way before.
The iMac failed to boot in safe mode (stops booting at 25% and then freezes on apple logo), and show no issues with AHT tests.
I can boot in single user mode, but it reboots after a few seconds. I noticed some errors messages during this boot.
It fails to boot in verbose mode, showing a few lines of errors (images attached), and then freezes in a green horizontal line screen.
I can still boot from Bootcamp flash drive and Ubuntu Flash drive, and install both OS. The only issue is with OsX itself. I have used Gparted in Ubuntu to Format the hole partition to HFS+, and can't find any errors in hard drive tests.
I thought about buying a thunderbolt cable and try to do a Clone of my other iMac, but don't know if it will work.
Any other tests/suggestions about this issue?
Regards,

Fixed the problem with this setup
Of course this means i just lost 4GB.
Let me tell the full story.
In the beginning, long ago, once upon a time. My iMac had 2x2GB ram sticks which were in the two DIMM1 Banks. I then told myself "I WANT MORE RAM BECAUSE LOLZ". So i bought 2x4GB ram sticks. The two empty slots were Bank 0/DIMM0 and Bank 1/DIMM 0. and I added them in there. having done that, I booted OS X up, worked great, had 12GB, everything was shiny and beautiful. Soon after I wanted to try it out on windows. I restarted my computer and BAM the blinking cursor just sits there, being stubborn and all. I then told myself "holy balls, this new ram i got is bonkers" (them words, I blame the language filter). Then after giving it a little thought, i just asked myself if it was because I had ram from two different manufacturers. I removed my old ram, which has nice Samsung stickers on them, and booted it up on windows. Still had the same problem, I then decided that maybe this is all really mentally challenged so to win I had to think like a retard. I took my new ram and inserted it in the same slots where my old ram sticks were (DIMM1 Banks), booted windows up and IT WORKED.
I still hold all of my WHYs on this subject but I will keep messing around to see if I find a better solution than just leaving both DIMM0 banks empty

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Of course this means i just lost 4GB.
Let me tell the full story.
In the beginning, long ago, once upon a time. My iMac had 2x2GB ram sticks which were in the two DIMM1 Banks. I then told myself "I WANT MORE RAM BECAUSE LOLZ". So i bought 2x4GB ram sticks. The two empty slots were Bank 0/DIMM0 and Bank 1/DIMM 0. and I added them in there. having done that, I booted OS X up, worked great, had 12GB, everything was shiny and beautiful. Soon after I wanted to try it out on windows. I restarted my computer and BAM the blinking cursor just sits there, being stubborn and all. I then told myself "holy balls, this new ram i got is bonkers" (them words, I blame the language filter). Then after giving it a little thought, i just asked myself if it was because I had ram from two different manufacturers. I removed my old ram, which has nice Samsung stickers on them, and booted it up on windows. Still had the same problem, I then decided that maybe this is all really mentally challenged so to win I had to think like a retard. I took my new ram and inserted it in the same slots where my old ram sticks were (DIMM1 Banks), booted windows up and IT WORKED.
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