Is the display very dim or very bright?įor now, if the computer is working fine, please perform these steps to uninstall the display drivers and reinstall it by following these steps:.Kudos to you for that.įor better clarity and to assist you better I would require information regarding this: Superb description and stupendous diagnosis of the issue before posting. I reviewed the post regarding assistance to download the display drivers. Business PCs, Workstations and Point of Sale Systems.Printer Wireless, Networking & Internet.DesignJet, Large Format Printers & Digital Press.Printing Errors or Lights & Stuck Print Jobs.Notebook Hardware and Upgrade Questions.Did they replace the Logic Board because the firmware was corrupted and this was a faster method? What is the startup noise? The SD card issue just makes it a deeper mystery. The file system description is not accurate. (The other problems yet unresolved are getting rid of that irritating start up noise ((the script file solution worked for a while, then stopped working)) and Windows constantly complaining about a disk not being inserted in the SD card slot.)Ī restore from an El Capitan backup would have been an option. This is where I now have several problems I never had with El Capitan, screen brightness control just one of them. So I then used Boot Camp to partition the disk, install the Windows drivers and install Windows 10. I assume they erased everything as there was only a single partition on the disk when I got it back. They rebuilt the system with Sierra 10.12.6. Still under warranty, I left my Mac at the local Apple store. Worse yet, in order to repair it I had to erase and rebuild my hard drive blowing away the Windows partition. It was an Apple employee at the store who told me that the file systems between El Capitan and Sierra were not compatible and they way it failed left the boot code unable to recover. After many chats and phone calls with Apple, I was told that the OS X partition was not recoverable. It would try 3 times then fail telling me it was not repairable. I got busy at work, so I used Windows for some weeks before I had a chance to get back to OS X. Windows worked just fine (even the brightness keys). This was repeatable.īut I was able to hold the Option key and boot into Windows. When I powered up, the status bar would run to about 95%, then the Mac would shut down again. I walked out of the room for a while near the end of the download, and when I returned the Mac was turned off. I started the Sierra download, WiFi, Mac plugged in. But it depends on the answer to my first question. The difference is the EFI between El Capitan and Sierra. None of the drivers interact with other OS's drivers. So I'm not seeing how booting El Capitan off an external drive is going to narrow down the problem. I'm also guessing that if I boot El Capitan off an external drive, the Windows drivers also are not installed. I'm guessing that if I boot OSX, the Windows drivers are not installed. If that was not applied or incorrectly applied, EFI device discovery can be compromised. What is the version of Sierra? Some 10.12.x releases of Sierra contain newer EFI firmware. And since both computers have the same problem, I assume it's Sierra and not anything else. I believe the problem is due to Sierra drivers installed when using Boot Camp on Sierra. If the upgrade crashed, how did you correct the issue? The Apple explanation seems rather bizarre. I was told by Apple the crash happened because the computer shut down (by itself) and there is a disk format difference between the 2 versions preventing it from recovering from the crash. This whole fiasco started because the upgrade from El Capitan to Sierra crashed and destroyed the boot sectors for OSX. I thought about this more since last night.
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