![]() I thought I'd try and convert it over to a basic linux box and get another couple of good years out of it. I want to wipe this iMac clean and get rid of Boot Camp and install Mac OS on it.Ģ009 mac mini: gray blank screen boot commands not working This old mac mini (Intel Core 2 Duo model, pretty sure it has 8GB RAM) has been good to me, but is super slow now and the disc drive hasn't worked for years. I believe that the Mac OS partition was corrupted when the previous owner of this device installed Boot Camp (and the previous owner does not remember which version of Mac OS was is installed by the way). I also swapped the hard drive SATA cable, and put everything back together with the original hard disk but still boots to Windows 7. Then I tried to boot into Safe Mode, and it showed a white screen with a grey folder with a question mark on it. ![]() I swapped the Barracuda hard drive with another hard drive and upon booting it brings me to the Windows 7 "No bootable device" black screen. When I hold the Option key while booting, it only shows my Windows 7 partition and nothing else (no Recovery partition, no Macintosh HD). I made a bootable USB with OS X Lion on it (I believe it was the OS X that came with this model of iMac) but the iMac does not seem to detect the flash drive. I tried to reset the PRAM/NVRAM but no result (I also swapped the NVRAM coin battery). ![]() I cannot go into Recovery Mode or Internet Recovery Mode. When I click the Boot Camp icon and choose to restart in macOS it displays "Could not locate the OS X boot volume." ![]() I have purchased a second-hand 2011 iMac 21.5" (A13) few days back and it only boots to Windows 7. Bootcamp: "Missing operating system" Hi,I can't boot my MacBook into Windows anymore after installing Ubuntu.I tried to additionally install Ubuntu (without rEFInd) and followed this article on how to achieve that on an already dual boot setup Mac (with macOS and Windows): acos-and-windows-already-installedAfter shrinking the macOS partition & creating new partitions on the hard drive and installing Ubuntu successfully on them, I tried to launch Windows 7 again but the message "No operating system" is shown now instead (the data on the Bootcamp drive is still accessible from macOS though).I already tried repairing the Windows partition with a Windows recovery USB drive (created with Windows and the Bootcamp assistant), as mentioned on this website: ing-system-error/Unfortunately Windows' "diskpart" doesn't show all the partitions (in the way diskutil list would) and repairing doesn't seem possible as mentioned.Now I'm lost finding out how to repair the Windows partition, either in macOS or in the Windows recovery tools.MacBook Pro late 2013, macOS Sierra, Windows 7, Ubuntu 18.04Any help is gladly appreciated.Thanks a lot in advance!> diskutil list disk0/dev/disk0 (internal, physical): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *500.3 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Macintosh HD 340.0 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 4: Linux Swap 800.0 MB disk0s4 5: Linux Filesystem 60.1 GB disk0s5 6: EFI NO NAME 500.2 MB disk0s6 7: Microsoft Basic Data BOOTCAMP 98.0 GB disk0s7> sudo gpt -r show /dev/disk0gpt show: /dev/disk0: Suspicious MBR at sector 0 start size index contents 0 1 MBR 1 1 Pri GPT header 2 32 Pri GPT table 34 6 40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 409640 664062496 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC 664472136 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC 665741672 1562496 4 GPT part - 0657FD6D-A4AB-43C4-84E5-0933C84B4F4F 667304168 1816 667305984 117415936 5 GPT part - 0FC63DAF-8483-4772-8E79-3D69D8477DE4 784721920 976896 6 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B 785698816 191406080 7 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 977104805027 32 Sec GPT table 977105059 1 Sec GPT header> sudo fdisk /dev/disk0Disk: /dev/disk0 geometry: 60821/255/63 Signature: 0xAA55 Starting Ending#: id cyl hd sec - cyl hd sec -1: EE 0 0 1 - 1023 254 63 *2: AF 1023 254 63 - 1023 254 63 HFS+ 3: AF 1023 254 63 - 1023 254 63 HFS+ 4: 82 1023 254 63 - 1023 254 63 Linux swap 4211 3Ģ011 iMac only boots to Windows 7 Good day, ![]()
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