BOOTMGR is missing

psc — Mon, 19 Mar 2012 17:22:40 -0000

I didn't touch anything but suddenly I cannot boot in Windows 7 or Ubuntu on my MacBook Pro (Santa Rosa). The message is BOOTMGR is missing. My assumption is that my second hard drive is now the first hard drive, meaning that normally my 500GB is /dev/disk0, but now my 200GB is /dev/disk0. On Santa Rosa, my 200GB is connected with ATA and my 500GB is SATA, both use GUID Partion Table.

How to tell my Mac to use the SATA first, maybe that will fix my problem? Or how to disable the 200GB without opening my Mac?

Here's more information on the partition, since my SuperDrive DVD is broken and that Santa Rosa is not booting from USB (something like USB legacy is not supported)...

500GB - SATA /dev/disk1 *should be first*
Number Start (sector) End (sector) Size Code Name
1 40 409639 200.0 MiB EF00 EFI System Partition
2 409640 156965623 74.7 GiB AF00 Untitled
3 157227768 606475343 214.2 GiB 0700 Untitled
4 606475344 976773127 176.6 GiB 0700 Untitled
1 =
Partition GUID code: C12A7328-F81F-11D2-BA4B-00A0C93EC93B (EFI System)
Partition unique GUID: A38E3351-5D64-4ACD-8A4F-7005B334C879
First sector: 40 (at 20.0 KiB)
Last sector: 409639 (at 200.0 MiB)
Partition size: 409600 sectors (200.0 MiB)
Attribute flags: 0000000000000000
Partition name: 'EFI System Partition'

200GB - ATA /dev/disk0
Number Start (sector) End (sector) Size Code Name
1 40 409639 200.0 MiB EF00 EFI System Partition
2 409640 97401831 46.2 GiB AF00 MAC50GB
3 97665024 194666495 46.3 GiB 0700 WIN50GB
4 194666496 390721535 93.5 GiB 0700 EXT
1 =
Partition GUID code: C12A7328-F81F-11D2-BA4B-00A0C93EC93B (EFI System)
Partition unique GUID: 56D21DB0-7070-4DE0-AC39-15BA5FC847E1
First sector: 40 (at 20.0 KiB)
Last sector: 409639 (at 200.0 MiB)
Partition size: 409600 sectors (200.0 MiB)
Attribute flags: 0000000000000000
Partition name: 'EFI System Partition'

If anyone can help me!

Recent changes to 107: BOOTMGR is missing

BOOTMGR is missing