New iMac - 10.8.3 - Windows 8 - Bootcamp error EFI - MBR - GPT - Bios won't let me select Bootcamp partition
iMac late 2012 - Bought - Updated 10.8.3
W8 ISO downloaded (tried with 2) > Bootcamp > USB Booteable created
Bootcamp > Install Windows7 (8) > Partition disk (gave W8 75gb), all fine. After it's ready the iMac restarts.
It restarts and remains in a black screen. I have to force power off, restart manually.
Holding 'Alt' I DO GET into the booteable menu:
I see:
[Macintosh HD]
[Windows]
[EFI Boot]
If I select [Windows] I get to that same black screen I initially got before by bootcamp assistant
BUT WHEN I SELECT [Efi] I DO GET THE WINDOWS 8 INSTALLATOR!!
From there, all fine, language selection > Next > Serial Key > Next... BUT WHEN THE PARTITION/DRIVE INSTALLATION WINDOW SHOWS UP
IT WONT LET ME SELECT THE BOOTCAMP PARTITION
"The selected disk has a MBR partition table. On EFI sistems, Windows can only be installed on GPT disks"
"You can't install Windows in this disk. It is possible that the Hardware is not able to boot in this disk. Make sure he dis controller is able in the system BIOS"
I try from there to FORMAT THE DRIVE (it gives you a chance) But still theres NO WAY I CAN GO "NEXT" in the next installation step.
It has been 3 days trying and trying, PLEASE HELP BOOTCAMP GURUS!
From my experience last week installing Windows 8 on a 15" MacBook Pro (Mid 2010).using 10.8.3 OSX.
I used BootCamp Assistant to partition the OSX drive.
I have a Full Version Windows 8 x64 DVD and inserted that into the Internal DVD of the MBPro on reboot after BootCamp was finished.
I restarted and got nothing but a Black Screen.
I powered off and restarted using the Option Key.
Three Icons appeared MacintoshHD, Windows DVD Icon, and EFI Boot
I thought the DVD might be FU'd so I tried EFI Boot which did nothing.
Before burning another Windows 8 DVD I tried to hook up my LaCie FireWire external DVD with the Win 8 Install DVD inserted.
Again nothing.
So I removed the Win 8 Install DVD from the external La Cie and inserted it back into the Internal MBPro DVD.
Did a Power Off Reboot with the Option Key depressed at the chime.
Again the three icon choices.
This time selected the Windows DVD Icon and got a Black Screen agian.
BUT THIS TIME I JUST PATIENTLY WAITED!
After about 20 minutes the Windows 8 Installation Process started and I got to Install everything to the new BootCamp Partition.
I had to format the BOOTCAMP Partition to NTFS using the advanced option and had to choose NEW installaltion NOT UPGRADE.
Windows 8 installed perfectly and I installed the drivers after installation completed from the Internal DVD from another DVD I had burnt with just the Windows 8 Support Software..
I was surprised that that the MBPro took so long to recognize the Internal Win 8 Installation DVD but it did eventually recognize it and installed flawlessly.
Try the PATIENT approach and let us know if we may have found a clue here.
BTW I used System Recovery Boot Disk Utility to both Repair Hard Drive and Repair Permissions before attempting any of the above and also made a Full Time Machine Backup.
Better Safe than wiping your drive.
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