response to gman1233Take each of th

response to gman1233
Take each of these steps that you haven't already tried. Stop when the problem is resolved.

Step 1

The first step in dealing with a boot failure is to secure your data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since your last backup, you can skip this step.

There are several ways to back up a Mac that is unable to boot. You need an external hard drive to hold the backup data.

a. Boot into the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.”
b. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
c. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to boot, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can boot now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
If you've booted from an external storage device, make sure that your internal boot volume is selected in the Startup Disk pane of System Preferences.
Step 3

Boot in safe mode. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Post for further instructions.

Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.

The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

When you boot in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, your boot volume is damaged and the drive is probably malfunctioning. In that case, go to step 5.

If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.)

If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.

Step 4

Sometimes a boot failure can be resolved by resetting the NVRAM.

Step 5

Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.

This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual.

Step 6

Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.

Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication.

Step 7

Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup.

Step 8

A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions.

Step 9

If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.

Hasil (Bahasa Indonesia) 1:

Respon untuk gman1233Mengambil setiap langkah yang Anda belum sudah mencoba. Berhenti ketika masalahnya diselesaikan. Langkah 1 Langkah pertama dalam berurusan dengan kegagalan boot adalah untuk mengamankan data Anda. Jika Anda ingin melindungi isi startup drive, dan Anda belum memiliki setidaknya satu backup saat ini, Anda harus mencoba untuk membuat cadangan sekarang, sebelum Anda melakukan apa pun. Mungkin atau tidak mungkin. Jika Anda tidak peduli tentang data yang telah berubah sejak cadangan terakhir Anda, Anda dapat melewatkan langkah ini. Ada beberapa cara untuk membuat cadangan Mac yang tidak dapat boot. Anda perlu hard drive eksternal untuk menyimpan data cadangan. a. boot ke pemulihan partisi, atau dari waktu setempat mesin cadangan volume (pilihan kunci pada startup.) Bila muncul layar OS X utilitas, jalankan Disk Utility dan ikuti petunjuk di artikel dukungan ini, di bawah "Petunjuk untuk backup ke hard disk eksternal melalui utilitas Disk."b. jika Anda memiliki akses ke Mac bekerja, dan itu dan non-kerja Mac memiliki FireWire atau Thunderbolt Port, boot Mac bekerja dalam target disk mode. Menggunakan kerja Mac untuk menyalin data ke drive lain. Teknik ini tidak akan bekerja dengan USB, Ethernet, Wi-Fi atau Bluetooth.c. Jika drive internal Mac non-kerja dapat diganti pengguna, menghapusnya dan me-mount di dock kandang atau drive eksternal. Menggunakan Mac lain untuk menyalin data.Langkah 2Tekan dan tahan tombol daya sampai kekuatan menutup. Putuskan semua kabel peripheral kecuali diperlukan untuk boot, dan menghapus semua kartu ekspansi aftermarket. Menggunakan keyboard yang berbeda dan/atau mouse, jika perangkat tersebut disadap. Jika Anda dapat boot sekarang, salah satu dari perangkat Anda terputus, atau kombinasi dari mereka, yang menyebabkan masalah. Mencari tahu mana yang merupakan proses eliminasi.Jika Anda sudah bisa boot dari perangkat penyimpanan eksternal, pastikan bahwa volume internal boot Anda dipilih di panel Startup Disk System Preferences.Langkah 3 Boot di safe mode. Catatan: Jika diaktifkan FileVault, atau jika firmware password diatur, atau jika boot volume perangkat lunak RAID, Anda tidak bisa melakukannya. Posting untuk petunjuk lebih lanjut. Safe mode jauh lebih lambat untuk boot dan menjalankan dari normal, dan beberapa hal tidak bekerja sama sekali, termasuk jaringan nirkabel di Mac tertentu. Layar login muncul bahkan jika Anda biasanya masuk secara otomatis. Anda harus tahu login password Anda untuk login. Jika Anda lupa sandi, Anda perlu menyetel ulang sebelum Anda mulai. Bila Anda boot di safe mode, itu normal untuk melihat bar progres abu-abu gelap di latar belakang abu-abu terang. Jika progress bar terjebak selama lebih dari beberapa menit, atau jika sistem menutup otomatis sementara kemajuan bar akan ditampilkan, volume boot Anda rusak dan drive mungkin rusak. Dalam hal ini, pergi ke langkah 5. If you can boot and log in now, empty the Trash, and then open the Finder Info window on your boot volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then reboot as usual (i.e., not in safe mode.) If the boot process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions. Step 4 Sometimes a boot failure can be resolved by resetting the NVRAM. Step 5 Launch Disk Utility in Recovery mode (see Step 1.) Select your startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately. This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then reboot as usual. Step 6 Boot into Recovery again. When the OS X Utilities screen appears, follow the prompts to reinstall the OS. If your Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade. Note: You need an always-on Ethernet or Wi-Fi connection to the Internet to use Recovery. It won’t work with USB or PPPoE modems, or with proxy servers, or with networks that require a certificate for authentication. Step 7 Repeat step 6, but this time erase the boot volume in Disk Utility before installing. The system should automatically reboot into the Setup Assistant. Follow the prompts to transfer your data from a backup. Step 8 A dead logic-board battery in a Mac Pro can cause a gray screen at boot. Typically the boot failure will be preceded by loss of the startup disk and system clock settings. See the user manual for replacement instructions. Step 9 If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store to have the machine tested.