First of all thanks for all the discussions and files provided; they helped a lot.
Second; to summarize I have successfully installed Yosemite on N53SN model ( i7 - 4 GB Ram - 120 Gb SSD - Nvidia 550m ) yesterday with #####/##### and boot loader is chimera 4.0.1.
Things that work are : Touchpad , Keyboard , Function Keys , Graphics , Audio , DVD , Reboot/Sleep
Wifi gave me a hard time after installation. I tried many kexts and troubleshooting tutorials but in the end it worked after re-installing Yosemite without formatting. I am not sure if it was related to disk permissions ( I tried before re-installing on Disk Utility to fix ) or something else but now wifi is working flawless. I am not sure about ethernet and didn't test since I don't have cables at home. But looks ok in the system info.
Bluetooth is also problematic ; seems to be always on and can't turn it off. Can't detect any other device during scan. And in system report no devices are shown. Any help is appreciated.
Camera is the biggest problem. It works , but restarts itself every 2 second. So when I open up Skype or FaceTime it is constantly rebooting and the image comes and goes. If any of you had this problem and can provide a solution it would be great. Since I can see myself on the screen, it looks software related problem %99. This is from the system info :
USB Video Device:
Model ID: UVC Camera VendorID_5967 ProductID_5912
Unique ID: 0x1a120000174f1718
And this is from the usb tab :
USB Video Device:
Product ID: 0x1718
Vendor ID: 0x174f
Speed: Up to 480 Mb/sec
Manufacturer: Sunplus iT Co
Location ID: 0x1a120000 / 4
Current Available (mA): 500
Current Required (mA): 500
USB 3.0 looks installed but can't detect my Seagate extension drive with usb 3.0 cable somehow. Here are details :
USB 3.0 Hi-Speed Bus:
Host Controller Location: Built-in USB
Host Controller Driver: GenericUSBXHCI
PCI Device ID: 0x1000
PCI Revision ID: 0x0004
PCI Vendor ID: 0x1b73
Bus Number: 0x0f
So if anyone has updated to Yosemite and has working stuff listed above it would be great to have some help. One other thing is I can't follow which kext is installed and properly working for a certain device. On some screenshots you shared I saw a list of kexts with ticks on left of them. Can't see something like that. After installing kexts I can't be sure if they are properly installed ( with permissions etc.) I hope I don't need to re-install Yosemite every time to fix this problem with kexts - I am using Kext Utility v2.6.1 BTW.
And one other question to N53S hackintosh users ; is your fan always working ? Mine is always on ( I don't have an option in BIOS for this ) , even if no process is going on the computer ( idle state ). Not disturbing soundwise but kinda worried.