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10

It's not directly that Apple doesn't want you to do so, it's more that older OS versions are lacking the drivers etc. required for hardware which wasn't even known at the time the older OS was released. The most obvious example for this in your case is the Retina display (and the graphics driver required for it), there are probably a lot more parts including ...


5

Think about it this way, OP. When Snow Leopard was released in 2009, it had no way to know how to "talk" to a 13" MacBook Pro Retina which would be released 4 years later. It doesn't know how to drive the video card, the network card, even the logic board to some extent. You would rightly expect kernel panics and other weirdness. That said, you can still ...


2

A new Mac will have trouble running previous releases. The older releases won't have necessary drivers for the newer hardware. However, there are two things that might make it possible: First, a newer machine might be using older hardware that the older OSX does support. Try it out. If you treat your new hardware as a non-Apple PC, you can follow various ...


2

I have a Mac desktop that I updated to Yosemite. After an initial start, it kept going to blank gray screen in the middle of bootup. I have several accounts on this machine. I finally restarted in safe mode and after logging on to my administrative account the Mac informed me I had a piece of incompatible software -- "Instant On". This was automatically ...


1

Ok, I managed to boot to Safe mode using this: Access the command line by either opening Terminal remotely, or by logging into the computer using SSH. Use the following Terminal command: sudo nvram boot-args="-x" If you want to start in Verbose mode as well, use sudo nvram boot-args="-x -v" instead. After using Safe Mode, use this ...


1

I shut down the computer, unplugged anything that was attached to it (peripherals, power cord, etc.), held down the power button for more than 10 seconds, plugged power cord, keyboard and mouse, turned the computer back on, waited for main screen, and inserted DVD. It took a while for it to read and install but finally got it to work. Got it from this post ...


1

Finally figured this out. It was pretty simple in the end. Here is a summary of my problem and the solution. Installed Yosemite on my SSD Enabled Trim (oops!!) Rebooted and got grey screen with crossed out circle Rebooted into Recovery Tried Time Machine Backup, which failed Installed Yosemite on backup drive partition Couldn’t erase / partition ...


1

What happens if you shut it down & restart just holding onto the option key? That should give you the “Startup Manager” screen which will let you choose a startup disk; more details from Apple’s site. Also if you have a USB drive—thumb drive or other kind of drive—you might be able to boot from that to get some kind of disk repair to happen. When you ...


1

In OS X, the routing table is mostly managed by configd, based on the network settings in /Library/Preferences/SystemConfiguration/* and the live status of the network interfaces (e.g. is there something plugged into the ethernet jack at the moment?). The network settings can be examined by looking in ...


1

If you have hold down the shift key during startup it can go to safe mode. Sometime due to disk issue and new software installation it may go to safe mode. Try restarting normally and it should be back to normal mode. If you have installed anything new try removing them in safe mode.


1

I just tried three new hard drives and a 2006 Macbook wouldn't recognize any of them making them impossible to format with the OS X 10.4.6 Install discs. (The installer thought they were 7.26 TB disks, which wasn't correct, and it would give an Input/Output error when trying to format.) Tried a 10.6 (Snow Leopard) Install disc and it recognized the drive ...


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Ubuntu has instructions for most macbook pro's. Depending on which version of the macbook pro you have you may not need rEFInd: https://help.ubuntu.com/community/MacBookPro



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