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Jul 21, 2015 10:38 AM in response to littledragon294by Loner T,No. Do not remove EFI partition. If Step 1 did not work, try Step 2.
On a working machine...
diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 741.7 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
4: Microsoft Basic Data rMBPBCMP 258.0 GB disk0s4
sudo fdisk /dev/disk0
Disk: /dev/disk0 geometry: 121643/255/63 [1954210120 sectors]
Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: EE 0 0 2 - 25 127 14 [ 1 - 409639] <Unknown ID>
2: AF 25 127 15 - 1023 54 16 [ 409640 - 1448624648] HFS+
3: AB 1023 54 17 - 1023 60 39 [1449034288 - 1269536] Darwin Boot
*4: 07 1023 87 51 - 1023 238 3 [1450305536 - 503904256] HPFS/QNX/AUX
sudo gpt -vv -r show /dev/disk0
Password:
gpt show: /dev/disk0: mediasize=1000555581440; sectorsize=512; blocks=1954210120
gpt show: /dev/disk0: Suspicious MBR at sector 0
gpt show: /dev/disk0: Pri GPT at sector 1
gpt show: /dev/disk0: Sec GPT at sector 1954210119
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 1448624648 2 GPT part - 48465300-0000-11AA-AA11-00306543ECAC
1449034288 1269536 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1450303824 1712
1450305536 503904256 4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1954209792 295
1954210087 32 Sec GPT table
1954210119 1 Sec GPT header
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Jul 21, 2015 10:44 AM in response to Loner Tby littledragon294,Step 2 did not work too. Please help. Thanks so much.
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Jul 21, 2015 7:10 PM in response to Loner Tby littledragon294,Step 3: Boot to USB installer OS X and verify startup disc. Right?
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Jul 21, 2015 7:21 PM in response to littledragon294by Loner T,You are doing Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support .
Boot into Internet Recovery using Command+Opt+R after you power up the Mac (you need to see a spinning globe). Please use a wired connection.
In Utilities -> Terminal in Recovery Console run the steps in section Use fsck if necessary on disk0 - your internal disk.
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Jul 22, 2015 1:41 AM in response to Loner Tby littledragon294,Step 3 did not work, too. Should I reinstall OS X?
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