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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 ...


0

If you go into the screen that lets you re-download the OS and also gives you the ability to see disk utility command + r during bootup. Run disk utility and select the Mac Harddriive [not the OS partition] and run the Repair Disk Permissions feature and then restart the computer and you should have a permanent solution to the black/gray screen. RECAP ...


0

Make sure you are using a DVD with the image burned onto it instead of a USB drive. (USB images never seem to work.) Also rEFIt is still fine for use as the bootloader. Old question, I know, but it might help.


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I have just had a very similar problem: I had a Mac Mini on which there was nothing but Debian installed; my boss wanted a dual booting MacOS/Debian. With recent experiences in dual shrinking MacOS-partitions I thought it might be a good idea to set up partitions first, then reinstall MacOS. Everything went fine until I finished the debian installation and ...


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 ...


0

This lack of performance of Read improvement from a 2-disk RAID-1 is most definitely a design decision. I have, for literally decades, measured nearly double the read throughput on OpenVMS systems with software RAID-1, particularly with separate controllers for each member of the Mirror set (which, FYI, OpenVMS calls a Shadow-set). FYI: If your objective ...


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 ...


0

I'll post this as an answer, even though it didn't fix my problem – this was a lost case in the end. Aftermath: I dd'ed a backup of the Windows partition to my OS X partition: sudo dd bs=512 if=/dev/disk0 of=windows_backup skip=732993496 count=173955112 Now I had a 80 gig hex dump which I could examine safely. I used a hex editor to search for all kinds ...


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 ...


0

Create a USB Install drive, and do a clean install. http://www.macworld.com/article/2367748/how-to-make-a-bootable-os-x-10-10-yosemite-install-drive.html


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The fact that it resets the clock is usually an indication that the PRAM battery needs replacing. Without the PRAM battery keeping things running right, the clock can get messed up plus there can be all sorts of other wierdness that can be difficult to track down. With a machine of this age, it is a good idea to replace it anyway, and it seems pretty cheap ...


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 ...


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.


0

If you have booted from other media and tried Apple's tools then the only thing(s) left are 3rd party tools. My go-to is Diskwarrior and while some drives with a lot of files will cause it to fail (so I have heard) I've, personally, never had an issue with it. It has always worked and almost always fixed the problem. Failing that TechTool pro and Prosoft ...


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 ...


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 ...


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 ...


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 ...


1

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


0

Based on this post and the other one at MacBookPro10,1 goes to gray screen when a USB is inserted : I would say that you're probably looking at a faulty logic board. The system should be taken into a Genius Bar or an authorized Apple repair centre for further evaluation and/or repair.


0

Perhaps you need to download drivers for the mouse - I've found that personally, my RAT 7 works atrociously on OS X without the drivers and software for it. It'd help to know what brand and model mouse you have, however generic it may be.


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It sounds like your USB did not contain the clean bootable version. I would suggest you start over and follow the procedure from Apple. You can get a copy of 10.9.5 from here or from Apple Store. http://support.apple.com/kb/DL1761 Make sure the USB is single partition and minimal 8 Gig. (no other partitions on that disk)


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 ...



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