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Vertical bars/strips are usually indicative of a display malfunction. If you are also having booting problems, it is more likely GPU failure. You should take the iMac to Apple soon as it likely requires servicing. To backup your iMac, connect an empty hard drive with enough storage to back up your iMac, then go to System Preferences > Time Machine. Turn ...


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Does your system come up normally if you hold down the shift key while powering up? (That puts you into "safe mode".) If so, there's a simple software-only fix.


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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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If you're lucky, this is a common, and easily remedied iMac problem. Just tell me this: does your system come up in a usable state if you hold down the shift button while powering up? (That combination gets you into "safe mode".)


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One would say it is your Disk, it got damaged. Surprisingly the Verbose does not work at all? the "s" key for single-user mode. (Command-S) the "v" key for verbose mode. (Command-V) If you try the Single user, it should open the terminal. Alternatively you can use the Internet Recovery mode that already shows as option. Read this from Apple about ...


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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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There are 2 trouble shooting methods if the Safe mode fails. But before you go in to them, try the PRAM reset. Turn on your Mac. Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears. Continue holding the keys down until your Mac restarts, and you hear the startup sound ...


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First step is to discover if the OS on the USB stick is properly formatted and built for a boot device. For this you will need a Mac running OS X. Insert the stick and go to System Preferences → Startup Disk. If your stick is ready to boot a Mac it will appear in the selection pane :- If it is there then your USB stick is bootable. Just insert it into ...


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The problem was with Hard Drive Cable – it worked okay with SATA 2 devices, but can't recognize SATA 3 devices. On the similar MacBook Pro with stock cable everything worked fine. After I replaced it (https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Late+2011+Hard+Drive+Cable+Replacement/7655), everything also started to work.


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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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To Fix this issue do the following while your external monitor is plugged into the MacBook: Open Displays in System Preferences Click on Arrangement at the top of the window If Mirror Displays is checked, uncheck it The position of the two displays should now be shown in the Displays Window One of them will have a white bar at the top. This is probably ...


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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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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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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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You can only boot from a USB device if it contains the necessary startup files required for your Mac, generally either an operating system or operating system installation files. You could install OS X on a USB stick or drive, or you could use Disk Utility's Restore function to copy a bootable DVD/CD (or disk image) to a USB stick. Without the necessary ...


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USB thumb drives behave much like internal hard drives in terms of booting from it on a Mac. Therefore, it depends on what you have on those drives. If there is "just data" on the USB stick, it will, very much like "data" hard drives, not show up at the boot picker. As a test, you can try to install a for your system supported version of Mac OS X onto the ...


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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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Won't fix your issue, but, anecdotally… My Mac has been running 24/7 since 2008, never sleeping & only ever rebooting/shutting down for OS updates/hardware clean etc. No issues so far. So I'd say, yes, it's perfectly safe to leave it awake, so long as it has adequate cooling.


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I agree that you should test rEFInd using a flash drive. I see one can download "A USB flash drive image file" containing rEFInd. I believe you would be better off using my instructions. If you have any problems with my steps, let me know. Steps to Install rEFInd on a USB Flash Drive Download "A binary zip file" from The rEFInd Boot Manager: Getting ...


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USE THE WIRED KEYBOARD - Maximus put me on the right path - my iMac wouldn't respond to the startup key sequences using the Bluetooth keyboard; the wired keyboard worked perfectly. My DVD drive doesn't work, so I tried making a bootable usb hard drive and then a bootable usb flash drive from my Snow Leopard Installation DVD, and couldn't get the iMac to see ...


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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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Probably your pMBR/GPT got corrupted or the Base System is somehow mapped falsely. Usually the first partition (EFI) and the last partition (Recovery HD) aren't visible. Additionally a freshly erased disk0s2 ususally contains ~200 MB and not 1.4 GB (which is "by accident" the uncompressed size of a Base System). The best thing is to completly erase the ...


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There is nothing to delete here. You are currently using 1.5 Gig and you have 497 Gig free. Just install the new OS X.


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The question does not mention a model, let's assume that the Mac is a model that gained a firmware update in connection with Yosemite. If so, then – for use with Mavericks (without Yosemite) – it may be desirable to reinstall lesser firmware. … Erased HD … – that would have erased an operating system without affecting firmware. A suggestion ...


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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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Have you tried just command-v at startup? If it doesn't start up after that, check for any disk I/O Errors in the startup process. You will need to make sure you press that key combination straight after the boot chime. If the machine doesn't boot at all, you may try to reset the SMC. The procedure for this depends on the Mac model you have, see this Apple ...


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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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Presumably Windows messed up with your OS X boot code. You have to rebuild this code. Since OS X tools can not handle a false flagged partition you have to set the correct partition flag and afterwards rebuild the boot code using OS X Disk Utility. Since you can't boot from the now unaccessible recovery partition you have to have Linux-tools and a second ...


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For the sake of completeness, rather than add endless updates to the question, I have now achieved an reinstall from scratch. Once I discovered there was a second install on the other hard drive, I reconfigured the arrangement of the drives so that the Mac booted from the other. This took a few trial-and-error permutations with the disk cabling, and the ...


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Unfortunately you may have hardware issues if yours is an "Early 2011" model, many owners have reported symptoms similar to yours with the culprit being failed ball grid array solder on the graphics processor. There's some info here. The article has a link for a utility that will allow you run solely on the integrated Intel HD3000 graphics so at least you'll ...


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It is probably your video card. The 2007 MBP's were prone to this. Here is how you can tell. Download the Ultimate Boot CD. Burn it to a DVD or a USB Stick You will launch Linux with a ton of useful diagnostic tools. Run everything, but especially the video display diagnostic tool. Mine was throwing errors and I was able to definitively find the cause ...


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The Yosemite Installer package contains all the divers for all supported models. You are good to go for multiple uses on multiple systems.



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