Why won't macair boot up?

I think you may have to give some details in order to get some meaningful answers. Without details, it could be more than a dozen reasons ranging from a dead battery, bad adapter to a software problem.
Is this running Lion? Have you tried booting to the recovery partition? If not Lion, the recovery disk/flash drive?
Are you certain that the unit is powered (by a chaged battery or a working AC adapater)?

Similar Messages

Why won't iMac boot off external HD?

Hi I need help setting up a computer and when I connect my external hard drive it won't allow me to boot from it when I start it up holding (option). It lets me pick between recovery and the external and built in hard drive?

If the computere you are setting up is a New Mac and the external hard drive you are using is from an older Mac that is why it won't boot off the external. All New Mac's come with Special Builds of the current version of OS X and they will not boot or run off an older version of OS X Even IF that older version is the same Base version, like Mt Lion 10.8.x.
The version of OS X that is installed on newer Mac's have the correct Drive Package for the newer hardware. The external does not have the correct drivers.

Why won't DiskWarrior boot up my mac? (no entry sign when booting from DW)

I get a "no entry" sign (black circle with a diagonal line through it" when I try to boot from the DW dvd. I'm not sure which type of macbook I have but it was bought in January 2007, and before my file system got corrupted my OS was 10.4.11 . I can boot perfectly find from a Data Rescue 3 DVD (and have already used this to backup all my files) and from the OS X install DVD, so why am I getting this error when booting from DiskWarrior? The apple sign appears and the cog spins for a minute or two and then the no entry sign comes up and stays there...
It's DiskWarrior 4.2.

is this a disc which was mailed to you or one you burned? sometimes their downloaded "upgrades" are just for install only, you have to contact them for the disc...
if this is suppose to be a genuine boot disc, it could just be a bad burn. the boot DVDs should be apple partition map.

Why won't my Mac, with Mountain Lion installed boot up?

I had problems getting my Mac to boot so I made a Genius Bar appointment at my local Apple Store. The ran some tests and discovered a "disk i/o" error which they said indicated that my hard drive needed replacing. Hard drive replaced, brought it home, restarted, set up, Disk Utility run (permission checks out, disk checks out), Time Machine back up loaded and still all I get is the grey screen with the apple logo and the spinning wheel (not beach ball). Why won't it boot up? Any ideas???

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 Recovery by holding down the key combination command-R at the startup chime, or from a local Time Machine backup volume (option key at startup.) Release the keys when you see a gray screen with a spinning dial. 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 by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. 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.

Why won't my g4 desktop come on. I was trying to boot in safe mode and it would not go in safe mode. It won't come back on anymore. Can some tell me what to do.

Why won't my g4 desktop come on. I was trying to boot in safe mode and it would not go in safe mode. It won't come back on anymore. Can some tell me what to do.

Try Single User mode (Command+S while starting up).
Then, run fsck.
At the command-line prompt type:
/sbin/fsck -fy
Press Return. fsck will go through five "phases" and then return information about your disk's use and fragmentation. Once it finishes, it'll display this message if no issue is found:
** The volume (name_of_volume) appears to be OKIf fsck found issues and has altered, repaired, or fixed anything, it will display this message:
***** FILE SYSTEM WAS MODIFIED *****
Important: If this message appears, repeat the fsck command you typed in step 2 until fsck tells you that your volume appears to be OK (first-pass repairs may uncover additional issues, so this is a normal thing to do).
When fsck reports that your volume is OK, typerebootat the prompt and then press Return.
Your computer should start up normally and allow you to log in.
http://support.apple.com/kb/TS1417

Why won't my Intel iMac boot up, either from the internal hard drive or the DVD drive? It just displays a light grey screen, without any other icons, etc. The fact that it won't boot from the original system DVD is what baffles me the most. Any ideas?

Why won't my Intel iMac boot up, either from the internal hard drive or the DVD drive? It just displays a light grey screen, without any other icons, etc. The fact that it won't boot from the original system DVD is what baffles me the most. Any ideas? It uses the latest version of Mavericks. Thanks!

If the C key for Install Disc or R Command for OS X Recovery startup commands are not working, try holding the Option key for the Startup Manager.
see > Startup Manager: How to select a startup volume
If that does not work and you using a wireless keyboard, it may have become unpaired and you need to dig up a USB keyboard to invoke the startup commands.
For more on gray screen, see > Mac OS X: Gray screen appears during startup

G4733DA w/ 4 internal HD's sometimes won't mount/boot to alternate HD-Why?

I own a G4 733 DA w/ 4 internal HD's which sometimes won't mount/boot to an alternate HD on an internal Sonnet PCI controller card (position 1 only).
I can also boot to either of the 2 HD's on the sonnet pci controller card (even though neither shows up on system profiler in OS X.4.10). One of which is a Seagate 7200rpm, 400GB which I am currently booted to right now (it's in slot 2 of the sonnet pci card and works fine) However, at times the HD on slot 1 refuses to mount on the desktop. When I remove the same hard drive it mounts fine on an ext. FW enclosure.
Is it possible that slot one on this sonnet pci card is starting to go out? And how do I know for certain since neither of the HD's on this Sonnet pci controller card show up on system profiler? Is this normal? Shouldn't every hard drives show up in Apple's system profiler? Even the ones on the pci controller card? Should I just try a separate HD on the same slot and see what happens? I have all of the drives cloned to a much larger ext. FW HD so I'm not really worried about loss of data since I have all drives backed up to ext. FW HD's.

Neither of the HD's on this Sonnet pci controller card show up on system profiler. Is this normal?
Yes, it is normal. Earlier versions (before Panther) of System Profiler would show the drives connected to a Sonnet PCI controller, but current versions just show the controller itself. Disk Utility should show the drives.
Each port on the Sonnet card can have up to two drives, one Master, one Slave. The Master should be at the end of the cable. If a Western Digital drive is alone on a cable, it should be set to Single. Drives on the Sonnet card that are set to Slave are not bootable.
Try swapping cables at the Sonnet card. If the same drive has problems, then it is the drive or cable. Try swapping just the cables.

Why won't Apple give out the unlock code for an iPhone 3Gs when the contract was honored and I am still an AT

Why won't Apple give out the unlock code for an iPhone 3Gs when the 2 year contract was honored and I continued to be an AT&T customer with an iPhone 4. I wanted my old 3gs unlocked so my daughter could use it overseas when she is deployed. AT&T service over there *****, the international plan was not worth it. The individual SIM cards per country are much more reliable and cheaper. Teslestial in Iraq and Afghanistan, Telecom in Croatia,Vodafphone in Germany and Italy. Why Apple will not unlock these phones for our military to utilize is incomprehensible to me. These young men and women are fighting for these Apple people to go to work every day, safe, to live lives they have become accustom to yet releasing a phone to use on another network they can't do at least for the military.... WHY APPLE?? WHY? A good excuse not some of the many lame excuses I have received on the phone many times. AT&T states it is Apple that will not allow them to unlock the phones... Please tell me why? All I want Is my daughter to have a phone I trust, to be able to call me when she is given the free time to do so and I trust the apple phone.
Apple, please reconsider your stance on this issue. I am having a hard time understanding why you will not unlock the iPhone.
A simple code could allow me to talk to my daughter while fighting for our country the Great USA. Apple should be on the front line and enabling those fighting for our life, liberty and pursuit of happiness to use unlocked phones on reliable local GSM networks.
I honestly hope that someone who has some sort of authority to begin allowing the release of unlock codes, and not forcing people to unlock their phones with some program produced by some hack just to be able to use your wonderful phone. That is is in a nutshell, People love the iPhone so much that they want the ability to use it on the most reliable GSM carrier available to them. That should be a major compliment. Even men and women on the front line want your phone. I agree, my service is not the best where I live either, love the GSM technology so stay with it, but if I had the ability to change to the other GSM network that has much better coverage in this area of the country I would change. To change now I would not have my iPhone and that I will not part with.
Apple, please reconsider opening up the lock code and allow your gem of a phone to be used by many more people in many more areas and most importantly overseas fighting for our country. I know if this is really thought about Apple would understand and come to the conclusion to release the unlock codes, and stop the people from hacking in to use the iPhone on other networks.
I would love for my daughter to be able to use my iPhone 3gs while fighting for our Free country.
A response would be appreciated.
Thank you.
An Apple customer for 10 years, phones and computers.
P

Defiled:
I did sign a two year contract and completed that contract. The 3gs is no longer in service. My daughter is going overseas to protect you and your family. I was attempting to find a way for her to have a reliable phone that could offer her some connection with home as she travels through the middle east. She travels in missions all over.
At&T unlocks other phones of theirs why not the iPhone? AT&T says that Apple will not give them the code, it is not the carrier. If I would have known this situation would have come up I would have bought and unlocked 3gs phone"Deggie" . My main complaint is that Apple has not good excuse as to why they will not allow their phones to be unlocked from services well, AT&T . I bought the phone full price, completed the contract terms, even went for and iPhone 4 with another2 year contract, along with owning an apple computer... I love the product. My main issue is give me a good answer as to why you won't allow a phone to be unlocked. It doesn't hurt Apple, People still have to buy the phones from them, and use their App store and iTunes.
Sorry, just upset about my daughter heading over there, boots on the ground, and just pray she will be safe. Would have liked to facetime her while she is in the airports and in specific areas allowed for that.
Please don't come down on me for asking this question. I understand all the contracts etc.... but to single out the iPhone specifically to not unlock after contract is over does not seem fair.
Thank you for your responses.

Using Mac OS 10.8.5 why won't disk image from Utilities mount to open a .dmg file?

Using Mac OS 10.8.5 why won't DiskImage from Utilities mount in order to open a .dmg file?

Select the .dmg file and double-click it. FWIW, there's no DiskImage thing in Utilities on any of my boot volumes.
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

Why won't my Mac Pro sleep after Lion is installed?

Why won't my Mac Pro sleep after Lion is installed?

Tell us, what hardware add ons?
old software? that required PowerPC/Rosetta maybe.
Look for any apps, process that used powerpc and look for updates, check out RoaringApps for a table of Lion compatible programs
does it happen iwth a clean install?
how about if you do a Safe Boot?

Why won't my FireWire HD partitions stay mounted on my desktop?

Why won't my FireWire HD partitions stay mounted on my desktop? I recenly purchased a quad interface 500GB external HD from OWC (which is connected via FW800). I then partitioned it for TIME MACHINE, some room for a backup of my primary HD, and partitions for boot disks for LION, SNOW LEOPARD, & TIGER. All partitions seem to be OK as well as the backup I made of my primary HD (using SuperDuper). My Energy Saver prefs are set to sleep the display in 3 minutes and the Hard Drive in 15 minutes. I fried one of my processors on the old Quicksilver by setting the Hard Drive sleep to NEVER. Don't want to make that mistake again on this Mac Mini, but I'm afraid that it is these prefs that are causing the primary internal HD to sleep, and at the same time lose my new external HD. Mysteriously, I have a SimpleTech 160GB HD with two partitions connected via USB2.0 and these NEVER dissappear.
Anyone have some helpful advice? It would be greatly appreciated.

Well, it's now Sunday, around 11:00am. What I have discovered has nothing at all to do with Energy Saver prefs as I had previously suspected. This morning, after having unchecked the box that would "Put the hard disk(s) to sleep when possible," I woke the computer and discovered that once again all partitions of my new external hard drive were no longer mounted. So I thought of trying something new.
Because I believed it to be insignificant, I failed to mention that this hard drive has two FireWire 800 ports. One is connected directly to the Mac Mini, the other I used to daisy chain a connection to my iSight camera (FireWire 400) using a bilingual cable. I wondered if the daisy chain might be causing a problem somehow. Incidentally, the iSight camera launches iChat whenever I turn the new HD off and then on again. An action which has always caused the missing partitions to mount. iChat launches even if the aperture cover is closed (turns camera off). Note: connected this way the iSight camera has been working fine.
So this is what I tried next. I simply unplugged the bilingual cord connecting my iSight camera. The first time the computer went to sleep, when I woke it again all the partitions were right where they should be. So I took the next step by once again checking the box next to "Put the hard disk(s) to sleep when possible.” Now the Energy Saver prefs are once again set exactly the way they were before I bought this new drive. I left for church at 7:45 and returned around 11:00am. Again, when I woke the computer all partitions of the new drive were exactly where they should be.
So, problem gone. But now how do I connect my iSight camera? And why is it causing all the partitions for the external drive to drop from the desktop every time the computer sleeps?
I have a son in the Navy and use the iSight to video chat when he is overseas. Is there something obviously wrong about the way I had the iSight camera connected? I would certainly welcome any help or suggestions.
Thanks in advance,
—Lakerunner

HT2801 Why won't Windows 7 recognize the super drive?

Why won't windows 7 recognize the super drive? I have set up and it was working yesterday. I added a usb hup and a HDMI - Vga adapter to run two moniters? When I booted everything up again I found out that windows would not reconize the super drive. When I an running OS X, I have know issues.

You tried everything here:
iOS: Device not recognized in iTunes for Windows
including
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
What does diagnostics show?
iTunes for Windows: Gathering and using iTunes Diagnostics

Why won't my orders go through?I had no problem until March 2014 now I get charged and no coins or nothing happens after it says it went through

Why won't my orders go through? I had no problem until March 2014 then I got charged 7 dollars plus and got nothing. No coins. I put in a new credit card today it said it went through but got no coins

    Motherto2, I'm sorry to hear that you weren't able to turn your phone on! I know how important it is to rely on a phone, especially when traveling. I'm hoping this issue has been resolved, but if you still need assistance I can provide a few steps. First try clearing your system cache.
1. Boot into recovery
   o Press and hold Power, Choose "Restart" option
   o When screen turns off, press and hold Volume Down and Power
2. When the white HBOOT screen appears, use the volume button to move down to “RECOVERY.”
3. Press the Power button to select “RECOVERY.”
4. When the triangle and exclamation appears, hold the Volume Up and Power button at the same time.
5. Using the volume button, scroll down to “Wipe cache partition” and select it.
6. Select "Reboot system now"
If this is still not going thru, attempt an alternate master reset. http://goo.gl/MSrgE
If your phone is still not booting up after these steps, the device may need to be replaced thru warranty. Let me know if you still need assistance.
MarquiaF_VZW
Follow us on Twitter @VZWSupport

HT1338 Why won't my computer pick up the wireless in my home? All other computers in my home can get internet

Why won't my computer pick up the wireless in my home? All other computers in my home can get the internet.

Turn Off your computer. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your computer. Hopefully it will see the WiFi.
 Cheers, Tom

Why won't 9.2.1 install on my iBook?

Hi, I have an old Mac OS 9.2.1 cd (#691-3334-A) that I want to install onto an iBook that I recently bought so I can use old Classic software. I used the disc to boot up the computer and to initialize and partition the hard drive. However, when I clicked on the "Mac OS Install" icon, I got the message "This program cannot run on your computer. See the documentation for more information." This disc says on it "To start up from this cd, hold down the C key.... etc) so I would think it should work. I checked Wikipedia's Mac OS 9 page to see if OS 9.2.1 is compatible with the iBook G3 (with Firewire and dual USB) and the answer is yes. Sooooooooo..... why won't it install?

Dee, welcome to Apple Discussions.
There is no download of OS 9.0. It only comes on CDs which you have to buy however, the only way that you can install classic on your iBook is to use the CD that came with that model iBook. You can't even use a regular retail OS 9.x install CD to install classic.
There is another way to install classic. You can copy the System Folder containing OS 9.2.1 or 9.2.2 from another Mac & then copy the folder to your iBook.
In addition, when your hard drive was formatted, the OS 9 drivers must have been installed. You can check the System Profiler (About This Mac>More Info>Hardware>ATA) to determine if the drivers were installed.
 Cheers, Tom

Why won't macair boot up?

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