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3

You may already know this, but there is an apple repair extension for these kind of issues now. They'll fix it for free. https://www.apple.com/uk/support/macbookpro-videoissues/


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My hardware and software differs from yours. I will first document how I tested my answer and then try to adapt the answer to your needs. Since this is a fairly long answer, the adaption will be given as a separate answer. My computer is an iMac (20-inch Mid 2007). The version of OS X is 10.10.2. I will be installing Windows 7 Professional SP1 64 Bit. I ...


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Only thing that worked for me was to create the same Yosemite boot disk on a firewire drive. MacPro Desktop Tower: OS X v10.9.5; 2x3.2GHz Quad Core Intel Xeon, 14GM 800 MHz DDR2, MacPro3,1.


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Yeah, your video card is bad. The good news is that your iMac can run pretty well without a video card; it'll be fine for everything but the most demanding video games. So what you need to do is move the video driver out of the way, so the kernel doesn't try to load it. Do an "ls" in /System/Library/Extensions ("sudo ls /System/Library/Extensions") and ...


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Did you try to press the "option" key during startup? This will prompt you to select the startup disk if several are available. Set the system to boot into the one you will boot into most often, and if you want to boot into the other, press "option" when you switch the Mac on and wait for the prompt.


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Here is the set of Start up keys that you can try. I would try the Safe mode first, followed by Apple Hardware Test. If it does not boot in Safe mode and passes the Apple Hardware Test, use the OS X recovery "cmd+r" to restore your OS X installation.


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Here's something to try... If your Mac Pro has issues with booting from USB but will boot from a DVD, create a DVD from the USB installer. If you know how to do this then ignore the rest, grab a dual-layer DVD and get cracking. If not, read on... First, mount your USB installer and then go to Disk Utility. Highlight the partition Install OS X Yosemite on ...


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Here's one way of doing it, it's not elegant but it will work. Download and install Virtualbox and install Windows on it from your .ISO file. This will verify your .ISO is working. Once you've got Windows installed, download Rufus. This will create a bootable USB drive that will boot your MacBook, assuming the .ISO is good to begin with. Once that's done ...


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I had a similar issue and the below trick solved it. Resetting NVRAM Shut down your Mac. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. Turn on your Mac. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. Hold these keys until the computer restarts and you hear the startup ...


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I ran into the same problem, iMAC would not boot past the white screen, and I had lost my recovery disks. so I went to Apple website and bought more recovery disks, and when it booted up into recovery mode, it was not showing a target disk to install the op system because it was corrupt, so I then opened up the disk utility and erased the hard drive and then ...



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