![]() ![]() With both units disconnected it continues to fail.Ĭurrently, it only has a 16 Gb USB as a hard drive. Just in case, also disconnect the cable from the optical drive. I started again and it rebooted again :( again trying to update Safari. Disconnect the hard drive cable from the logic board. ![]() The mac rebooted again and while loading the OS it rebooted again! This behavior persists as long as a reboot failure occurs and I think I manage to stop this reboot cycle when I hold the power button and turn on again while pressing the option key to choose usb as startup.Īs you had indicated to me that the cable could be the cause of the failure. My joy ceased when it rebooted for no reason while trying to install the Safari update. I even managed to install the update "EFI Firmware Update 2.7". To my surprise and for the first time it managed to start! I put it in the macbook pro 2011 and by pressing option I told it to boot from it. Using my other computer (macbook pro early 2013) and internet recovery I installed mountain lion on a 16Gb pendrive. I read quite a bit about it and to try and rule out that this was the problem and did the following: I am in Argentina and the prices to take this equipment to an official service are exorbitant and unreliable.įirst of all thanks for your help and advice, in my many searches I found many of your contributions and they were always very helpful. Please if you can tell me what steps to follow or some guide would be saving me. when I look for if something needs to be updated, "MacBook Pro EFI Firmware Update 2.7" reappears I also did all the possible updates and only the installation of "MacBook Pro EFI Firmware Update 2.7" fails because when the Mac restarts to do the update, it restarts again and again and only continues in safe mode. it always restarts after 30% and starts again.Ĥ In the El Capitan version I uninstalled the drivers for the dedicated video card, hoping that was the problem, but I never got it to boot normally. Currently installing a minor version (mountain Lion) install the first stage, restart and start installing the second stage. Recovery using time machine, since I have a copy of High Sierra, I recovered the complete installation but the behavior is the same. This installation only works failsafe and I cannot start the diagnostic mode (D, cmd + D, option + D) nor the recovery mode (R, command + R) The installation was successful but when the mac tries to start it reboots before finishing the progress bar with the apple at the start. ![]() Installation via USB of El Capitan (failure to finish preloading the USB similar to Yosemite) but then I was able to install it with "Clover" and the installable image of El Capitan. Yosemite USB installation (failure to finish preloading the USB, the computer restarts and the installation begins again) I finally bought a used logic board in china and was able to successfully install it as a replacement for the deceased one.ġ The battery or battery charger does not work so the fans run at full speed.Ģ I was able to get it to boot but it does not recognize the SSD.ģ I put the original hard disk (unfortunately it had been used for a windows pc) and tried to install different versions of OS In the end, it failed again and when I took it to repair it again it did not work again. I have a Macbook Pro from early 2011 and I had problems with the video, I took it to a technician to reball it and it supposedly worked, at the same time it failed again and this time they told me they had changed the video chip. ![]()
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