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Laptop Compatibility
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It is best to have Sandy Bridge or Ivy Bridge

Many people post here asking "Will my laptop work." I will try to address some of the general issues with laptops in this post.

First off, I should mention that getting a laptop close to 100% functionality is always difficult (unless it is a ProBook 4x30s or 4x40s) and may not be possible or to the level you want. That's just because of the nature of laptops: you don't get to choose every hardware component (for OS X compatibility) like you can a desktop build.

That said, most newer laptops are generally compatible with Mountain Lion mostly due to the fact that the base components are provided by Intel CPUs and the Intel 6-series or 7-series chipset. If your laptop has a Intel Sandy Bridge or Intel Ivy Bridge CPU using HD3000 or HD4000 graphics, chances are you can attempt to make the laptop work with OS X.

Where the difficulty comes in is with all the other hardware and variables...

General Notes:

- CPU and chipset series: You need to know what exact CPU your laptop has. If it is Sandy Bridge it will have a model designation iX-2xxx*. If it is Ivy Bridge it will have a model designation iX-3xxx*. Haswell (supported starting with 10.8.5) is iX-4xxx*. You should also note your chipset version, currently either 6-series, 7-series, or 8-series. A mixed configuration (eg. Sandy Bridge CPU on 7-series chipset) is more difficult to configure than one that isn't mixed.

- Discrete graphics: Many laptops that have AMD Radeon or Nvidia GeForce discrete graphics utilize a switching mechanism to switch from integrated graphics (Intel HD) to the discrete card when the situation demands. This type of switching does not work in OS X and generally it means disabling the discrete capability in BIOS. If your BIOS does not allow it to be disabled, it can complicate the installation procedure (you may have to delete the related kexts). Also, it is possible that the discrete card is still drawing power even though you are not using it in OS X, so try to find a laptop without discrete graphics.

- WiFi: There are a limited number of WiFi chips supported by OS X drivers. In addition, OS X's WiFi driver architecture is not documented, so there are not very many WiFi driver "Linux ports" to OS X. There are some useful links for OS X WiFi in this post: http://www.tonymacx86.com/hp-probook/97099-wi-fi-bluetooth-cards-laptops-mac-os-os-x.html. In addition, some BIOS implementations have implemented a whitelist where only certain cards can be installed into the laptop, perhaps only cards branded specifically by the manufacturer of the laptop. Sometimes, the whitelist can be disabled via a hacked BIOS, but sometimes the BIOS is encrypted. The service manual for your laptop may give you a list of compatible cards and if one of those happens to also be compatible with OS X, then you can search for such a card and try replacing it. Some of the more compact laptops (Ultrabooks) have WiFi soldered onto the motherboard or combined with another componenent (mSATA SSD), making replacement more difficult or expensive. In many cases, the specific WiFi chip included with the laptop is not specified when you purchase.

- Ethernet: Ethernet is generally built-in to the laptops motherboard. And since OS X Ethernet driver interface is documented there are quite a few open source drivers available. Usually you can find one that works, but not always.

- Audio: Getting audio to work generally depends on finding or creating a patched AppleHDA (for best results and stability, don't use VoodooHDA except as a last resort). Although patching AppleHDA for any audio codec is possible, it is very involved, requires technical skills you may not have, and is time consuming.

- Camera: Most built-in cameras are USB, some are connected to USB2 and some to USB3. Some will work, some won't. There is no pattern, and there is no way to tell until you try.

- Card reader: Some card readers are on the PCI bus and have OS X drivers available from the manufacturer (certain Jmicron devices, for example). Some are on the USB bus and might work using the class driver built-in to OS X. You won't know until you try.

- Bluetooth: Sometimes bluetooth is built-in to the WiFi card (on the USB bus) and sometimes it is somewhere else (on the motherboard?). Bluetooth is always a rough spot on any OS X hack, so it may not work how you would like.

- Battery status: Battery status is possible to make work by using an ACPI compliant AppleSmartBatteryManager.kext. I generally recommend my own kext:https://github.com/RehabMan/OS-X-ACPI-Battery-Driver. Most DSDTs will need patching to 
work correctly with the vanilla AppleACPIPlatform.kext (and the latest AppleACPIPlatform.kext is required for Ivy Bridge power management). The patching required is often specific to the laptop family and requires some programming background to accomplish (unless you find a patch has already been done for you).

- Keyboard/Trackpad: Most laptops use the PS/2 interface for the keyboard and trackpad. OS X has no support for the PS/2 interface, so you will need to install drivers for it. What trackpad you actually have in your laptop determines which version you seek out. And most of the time, the trackpad manufacturer is not specified... sometimes varying even with the same model of laptop. There has even been a case of a laptop being sent out for repair and coming back with a trackpad from a different vendor.

- DSDT: Most laptops will require DSDT edits to get various laptop features working. You should be prepared to learn about DSDT patches, MaciASL, how to install to /Extra/dsdt.aml, etc. Don't fall into the trap of downloading a DSDT for another laptop. Find patches and patch your own. Native DSDTs can vary between laptops even that are the same model.

- BIOS: Some BIOS implementations are picky about booting. For example, some will not boot legacy mode to a GPT drive. OS X generally requires to be installed to a GPT drive, so this can be a problem. There are workarounds, but sometimes this can be difficult for the non-technical to understand.

In short, hacking a laptop is a challenge. You should not expect it will be easy. And there are many different laptops, each with unique configurations, BIOS, hardware combinations, etc. It is always possible that a given laptop will not work even if the hardware mentioned above seems to meet the requirements. 

And if you want 100% compatibility with a discrete graphics capability, perfect bluetooth and no hassles, don't look to a hack... buy a MacBook Pro.

Note on gen1 Core i-series CPUs

These laptops generally use "Intel HD Graphics" which are not supported very well by OS X. But some report getting it to work. There is a relatively extensive write up here:http://www.insanelymac.com/forum/top...graphics-qeci/

Note on Haswell systems

There is widespread reports of the OS X kernel (mach_kernel) rebooting early during initialization on some Haswell systems (especially laptops). From my understanding, this is due to the kernel now doing power management in the kernel (XNU CPU Power Management, or 'xcpm') for these systems instead of in AppleIntelCPUPowerManagement. There is no known solution to this problem at this point.
Thankss to RehabMan

Edited by Niresh
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Dear Niresh... I have  HP Probook 4530s and I literally don't have any access to MAC... I need to install Yosemite or Yosemite Zone. how do I prepare my usb.. ? Via Virtual Box or TransMac... Plz Help...

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