My MacBook does not start

My MacBook does not start up. I do not get further than the apple logo and spinning wheel

You could try the processes described in the following Support article to test and troubleshoot the computer, before applying the SMC reset section here...
•Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
This covers several items, including SafeBoot and others, that could help resolve the problem; including the reset notion itself. When you troubleshoot, not all items are necessary; stop at the first one that works. If none of them work, try them again. Maybe up to three times.
If you have the OS X install disc DVD, you may need to use it at some point, in troubleshooting or repair; since there also may be a problem with the hard disk drive or system startup files on it. The booted OS X install disc allows one to use OS X utilities, such as Disk Utility, to attempt repair; not limited to installations, the utility can attempt a repair on an unmounted system disk drive, thus booting Mac from the DVD.
Good luck & happy computing!

Similar Messages

Macbook does not start

Greetings. This is my issue:
I don't know why the macbook does not restart, if you try to restart it, it comes to black screen and i had to press the power button twice (Turn it absolutely off and turn it up), i took it to an apple authorized service center and he put an external HDD and restart it from this HDD then restart my macbook and it restarted normally, a few days later the problem persist.
Now the big deal: I turned it on, open safari and immediately it comes black screen and the status white led start blinking, i press the power button and stop blinking and press it again but it does not start, the blinking comes again... I left it off for an hour or so.
One hour later it boots normally but in few seconds it freezes and becomes a message in the screen that reads: " You need to restart your computer. Hold down the Power button for several seconds or press the Restart button". Then i press the power button, when i tried to restart it again there came a lot of strange stripes in the screen, gray and black with some color dots, a very weird thing, the "Start up chime" sounds about tree times and the stripes keep changing, always stripes. I restart it again, and the same thing happens one more time, and the third time i restart it it does not show anything on screen, all black and no sound, i tried putting out battery and everything Apple says to do when macbook does not boot, but nothing happens... i press the power button the sound of the HDD (I guess) that always sound, i can hear it, and the status white led is on, but not blinking, but nothing else....
what should it be?
it is a late 2007 macbook and out of warranty, does not have apple care.

This is what the last Kernel Report says:
Thu Jul 23 09:27:51 2009
panic(cpu 0 caller 0x00195080): "pmapremoverange empty hash removing hashed pv"@/SourceCache/xnu/xnu-1228.12.14/osfmk/i386/pmap.c:2072
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x2107fbf8 : 0x12b4c6 (0x45ec20 0x2107fc2c 0x13355c 0x0)
0x2107fc48 : 0x195080 (0x4651d0 0x32cfab0 0x4e33c80c 0x10000)
0x2107fcf8 : 0x1972db (0x32cfa6c 0x1000 0x0 0x105e008)
0x2107fd58 : 0x16abc5 (0x32cfa6c 0x1000 0x0 0x2000)
0x2107fe78 : 0x16b18d (0xffe00000 0x0 0x0 0x0)
0x2107feb8 : 0x13bb81 (0x32b9aa8 0x0 0x0 0xffe00000)
0x2107ff08 : 0x376f2a (0x29b770c 0x0 0x2107ff58 0x19c6b3)
0x2107ff58 : 0x376f58 (0x2c8be44 0x0 0x3169404 0x0)
0x2107ff78 : 0x3e2e3b (0x2c8be44 0x31693c0 0x3169404 0x1213)
0x2107ffc8 : 0x1a1bfa (0x3165520 0x0 0x1a40b5 0x3174208)
No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xbffffee8
BSD process name corresponding to current thread: scsid
Mac OS version:
9J61
Kernel version:
Darwin Kernel Version 9.7.0: Tue Mar 31 22:52:17 PDT 2009; root:xnu-1228.12.14~1/RELEASE_I386
System model name: MacBook2,1 (Mac-F4208CA9)
System uptime in nanoseconds: 18167463710
unloaded kexts:
(none)
loaded kexts:
com.apple.driver.InternalModemSupport 2.4.0 - last loaded 17433441031
com.apple.iokit.IOBluetoothSerialManager 2.1.6f8
com.apple.driver.AppleUpstreamUserClient 2.7.5
com.apple.driver.AppleHDAPlatformDriver 1.6.8a3
com.apple.driver.AppleHDA 1.6.8a3
com.apple.DontSteal_Mac_OSX 6.0.3
com.apple.iokit.IOFireWireIP 1.7.7
com.apple.driver.AppleGraphicsControl 2.8.11
com.apple.driver.AppleIntelGMAX3100 5.4.4
com.apple.driver.AppleIntelGMA950 5.4.4
com.apple.driver.AirPort.Atheros 319.10.3
com.apple.driver.AppleHDAController 1.6.8a3
com.apple.driver.SMCMotionSensor 2.1.1d2
com.apple.driver.AppleIRController 110
com.apple.driver.AudioIPCDriver 1.0.6
com.apple.driver.ACPISMCPlatformPlugin 3.4.0d10
com.apple.driver.AppleLPC 1.2.12
com.apple.driver.AppleBacklight 1.6.0
com.apple.driver.AppleTyMCEDriver 1.0.0d28
com.apple.driver.AppleIntelIntegratedFramebuffer 5.4.4
com.apple.driver.CSRUSBBluetoothHCIController 2.1.6f8
com.apple.driver.AppleUSBMergeNub 3.4.3
com.apple.driver.CSRHIDTransitionDriver 2.1.6f8
com.apple.driver.AppleUSBTrackpad 1.7.4f1
com.apple.driver.AppleUSBTCKeyEventDriver 1.7.4f1
com.apple.driver.AppleUSBTCKeyboard 1.7.4f1
com.apple.driver.XsanFilter 2.7.91
com.apple.iokit.IOAHCIBlockStorage 1.2.1
com.apple.driver.USBCameraFirmwareLoader 1.0.9
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.0.9
com.apple.iokit.SCSITaskUserClient 2.0.9
com.apple.iokit.IOATAPIProtocolTransport 1.5.2
com.apple.driver.AppleFileSystemDriver 1.1.0
com.apple.driver.AppleIntelPIIXATA 2.0.0
com.apple.driver.AppleFWOHCI 3.8.2
com.apple.driver.AppleAHCIPort 1.6.0
com.apple.driver.AppleUSBHub 3.4.0
com.apple.iokit.IOUSBUserClient 3.3.1
com.apple.driver.AppleUSBEHCI 3.4.3
com.apple.driver.AppleUSBUHCI 3.3.5
com.apple.iokit.AppleYukon2 3.1.12b14
com.apple.driver.AppleEFINVRAM 1.2.0
com.apple.driver.AppleSmartBatteryManager 158.10.0
com.apple.driver.AppleRTC 1.2.3
com.apple.driver.AppleHPET 1.4
com.apple.driver.AppleACPIPCI 1.2.4
com.apple.driver.AppleACPIButtons 1.2.4
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.2.4
com.apple.driver.AppleAPIC 1.4
com.apple.security.seatbelt 107.12
com.apple.nke.applicationfirewall 1.6.77
com.apple.security.TMSafetyNet 3
com.apple.driver.AppleIntelCPUPowerManagement 76.0.0
com.apple.driver.DiskImages 199
com.apple.BootCache 30.4
com.apple.iokit.IOSerialFamily 9.4
com.apple.driver.DspFuncLib 1.6.8a3
com.apple.iokit.IO80211Family 216.1
com.apple.iokit.IOHDAFamily 1.6.8a3
com.apple.iokit.IOAudioFamily 1.6.9fc3
com.apple.kext.OSvKernDSPLib 1.1
com.apple.driver.IOPlatformPluginFamily 3.4.0d10
com.apple.driver.AppleSMC 2.2.1d2
com.apple.iokit.IONDRVSupport 1.7.3
com.apple.iokit.IOGraphicsFamily 1.7.3
com.apple.driver.AppleUSBBluetoothHCIController 2.1.6f8
com.apple.iokit.IOBluetoothFamily 2.1.6f8
com.apple.iokit.IOUSBHIDDriver 3.2.2
com.apple.driver.AppleUSBComposite 3.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice 2.0.9
com.apple.iokit.IOBDStorageFamily 1.5
com.apple.iokit.IODVDStorageFamily 1.5
com.apple.iokit.IOCDStorageFamily 1.5
com.apple.iokit.IOSCSIArchitectureModelFamily 2.0.9
com.apple.iokit.IOATAFamily 2.0.1
com.apple.iokit.IOFireWireFamily 3.4.7
com.apple.iokit.IOAHCIFamily 1.5.0
com.apple.iokit.IOUSBFamily 3.4.3
com.apple.iokit.IONetworkingFamily 1.6.1
com.apple.driver.AppleEFIRuntime 1.2.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.iokit.IOStorageFamily 1.5.6
com.apple.iokit.IOHIDFamily 1.5.5
com.apple.driver.AppleACPIPlatform 1.2.4
com.apple.iokit.IOACPIFamily 1.2.0
com.apple.iokit.IOPCIFamily 2.6

My new MacBook does not start

My MacBook will not start, I am getting a gray or light blue screen and nothing happens.
Apparently this has a tendency to happen when the ITunes and Photo Booth are open within one session before I shut down the computer.
So far every time that I start the computer I have to press and hold the (control alt P R) keys, then the laptop starts and I get the apple in the screen and the rotating gear.
Please advice what to do?
I should point out that if I open other programs in a session and then shut down the computer, it does start normally when I restart.

The 4 times chimes is my old habit since os 7.5.3 sorry if that sound amusing to you, on apple sites 2 times is enough.
It will be the last option to do the re-installation.
But it usually help better, and you can narrow down the problem to other factor since the OS X is well installed and fresh.
I prefer install for the first time method, but you can choose archieve and install if you want to save your data there. Any method you choose make sure you back up your data before doing so.
But do you have a good connection in Thai, since I suggest you to update all the updater after you done the installation process.
Good Luck

MacBook does not start-how do I backup?

My Macbook is not starting properly - displays a gray screen with logo only. I have the MacOs installer ready to go into Disk Utility, Erase and then somehow install OS again.... I would like to know how can I make a backup of my files prior to erasing, since I cannot see my files anymore... any suggestions? Thanks!

What I have done in this situation is to plug in an external hard drive, and run the Mac install disk. Install Mac OSX on the external one. Then boot up from the external drive by holding down the option key at startup.
If you can't mount the internal hard drive, or see it on the desktop, you're out of luck. Probably a hardware issue. You could look into a more professional repair utility, or just bring it to a servicer.
However, if you can see the hard drive on your desktop, you can move on. Now we can make a clone of the internal hard drive. Go into Disk Utility (/Applications/Utilities/), and navigate to your boot drive (external). Go to the tab labeled "Partition". Add a new partition, and name it. This will be your backup partition. After you have done this, you should see an extra icon on the desktop. If not, troubleshoot "adding a partition."
Now we can make the backup. You can use free software such as SuperDuper, or Carbon Copy. Personally I use SuperDuper, and I will explain it with that software. Open it, and make sure you copy your internal hard drive (usually Macintosh HD), to the backup partition you just made. Now backup all files.
After this is complete you should have a bootable copy of your internal hard drive on your external hard drive. Try booting it up with by holding down the option key like before. From here, there are several courses of action.
1. You can attempt to use SuperDuper to copy the backup back to your internal hard drive. This works sometimes, but your internal hard drive will have to be in good condition. I reccomend trying it though.
2. Try reinstalling Mac OSX on the internal hard drive, holding option at startup and selecting the disk. There should be an option in the install process to import files and settings from another computer. Don't worry if you miss it though, because you can always do this from Migration Assistant (/Applications/Utilities/).
3. If neither of the above options, either try going to the genius bar, or getting a new internal hard drive. (A new computer works too .) If you opt for a new computer or hard drive, try importing from your backup on the external hard drive with step 2.
I have done this several time by attempting to dual boot Ubuntu. Good luck!!

My macbook does not start, gray screen, apple and turning gear appears

my macbook froze. then shut down the computer to clear the freeze condition. when trying to restart, the computer starts to boot,the apple appears on the screen, the gear rotates, however the computer does not continue to boot. can anyone help?

That would normally indicate a problem with the Hard Drive.
Do you have an Instal Disc to try to boot from? Hold the Mouse button down when powering up & eject if there's a Disc in it now.
The fans going strong is a safety feature when no OS is loaded.
Does it boot into any of these modes?
Holding Option/alt key at bootup.
Holding SHIFT key at bootup.
Target mode...
http://support.apple.com/kb/HT1661
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
We might get clues with verbose mode...
http://support.apple.com/kb/HT1492

Macbook does not start anymore after upgrade to Snow Leopard

I successfully upgraded my MacbookAir to Snow Leopard, but my son's Macbook refuses to start after having been upgraded.
Please help!

Hello,
my MacBook Pro (late 2008 unibody) just needs a main logicboard replacement, fortunatly still within warrenty, after updating to 10.6.0. I experienced the following: With an update from 10.5.6 to 10.5.7 the MBP freezed within 10min. after reboot, with every restart it freezed after a shorter period and finally freezed during the boot process. I've mounted the MBP as an external HD to my iMac, did an backup and deleted the internal MBP harddrive by overwriting it with zeros. I did the usual procedure of resetting SMC, P/V-RAM and reinstalled 10.5.6 - everything was fine again!
When Snow Leopard came out, I updated again, hoping the issue has been repaired. BUT I experienced the same problems and with some system permission deleting I got SL running as long as I did not turn on AirPort. As soon airport is activated and an internet connection is established I could count the seconds until the mac freezes. And it will only come up again by deleting the system configuration preferences (via single user mode booting).
Thereafter I was sure there is a hardware problem with the airport card or the logic board. The Apple Service Provider did not find any hardware failure and finally will change the logic board. Hopefully I got the Mac back next Tuesday. I let you know about the results.
Best regards!
PS: Obviously software could damage hardware or some hardware components used by Apple are not compatible with some of their software.

Macbook does not start up from any Windows Installation Disc

Hi:
I just bought one brand new MacBook Pro in March and I decided to install Windows two days ago. I created a 32 GB partition using Boot Camp (I had no problem at this point). However, when I restarted the computer (after I inserted an original Windows XP SP2 disc) it got freezed, and a black screen with a blinking cursor on the upper-left corner appeared. I repeated the operation many times with my XP SP2 and another Vista SP1 CDs, always with the same result. After that, I tried to install both systems on 2007 iMac and I had no trouble.
Could you help me with this?
Thank you!!
Ramiro

Hey guys,
I just recently ran into the same problem while trying to install Windows XP SP2 on my MBP. I tried a number of suggested solutions including:
1. Re-partitioning the HDD
2. Repairing the partitions using Disk Utility (requires OS X DVD boot for primary partition)
3. Copying my Windows to a new CD
4. Hitting the Option key during boot and selecting the Windows CD
None of the above worked. Here is how I finally got my Mac to boot from the Windows CD (this might not work for most or any of you - some of these problems are very case specific):
1. Start the Windows installation from the Boot Camp Assistant in OS X
2. When the computer restarts hold the Option key until you get the boot menu
3. You should see the original OS X option as well as the Windows CD
4. At this point pop out the Windows CD by hitting the eject key
5. Once the CD is out its icon disappears in the boot menu
6. Reinsert the CD and wait for it to spin up
7. Once the Windows CD icon re-appears as a choice select it and hit enter
However random this sequence of events might seem it actually worked for me. I hope it does for you too. Good luck!
Yuri

Macbook does not start after installing Leopard

I installed/upgraded to Leopard but had to cancel it despite the warning that the machine maz not be able to start up again. Hours later i started the mac again and the installation programe came on immedialtey. Installation was completed but on the restart it gets stuck. It just loads )apple sign with little loading sign below) but nothing happens!
Please help!!

If you bought your RAM at a place that also sells PC RAM you may have gotten mislabelled RAM. PCs can handle different RAM speeds so they’ll often label higher speed RAM as a lower speed rather than make two different speeds of RAM. But Macs are much more picky. They require a RAM stick to be exactly 667mhz not 675mhz or 800mhz. The way to tell is to put one of your old RAM sticks in and it will force the new RAM to run at the correct speed.
This is from one review of PNY RAM:
"These modules are actually 800Mhz. PNY no longer makes or sells 667Mhz modules. Not all computers that require 667Mhz are compatible with 2 800Mhz modules. They refuse to down clock properly. This is especially true with a number of Core 2 Duo MacBooks. Spoke to PNY support, they flat out told me that yes, they sell 800Mhz modules in 667Mhz packaging. If you RMA a module that is 667Mhz (or supposed to be 667Mhz) they will replace it with an 800Mhz module as they no longer have any 667Mhz SODIMMs, not even for RMA replacement!"

MacBook does not start after installing more RAM

Ok i bought a second hand MacBook from early 2009 and planned to use it to record songs in a small home studio using GarageBand, Live and protools, it came with 2gigs Of RAM and i tought i should take it up to 4 -the max it can handle- so i bought 2 2gigs a-data RAM sticks i took the factory ones out and put the new ones in but no way the "on/off" light turns on but nothing happens, no sound black screen, if i combine the factory ones and the new Inés whatever the order it works and i get 3 gigs combined but it just Won't Work with the 2 2gig ones in… the 4 are ddr2 working At 667mhz as i checked in the 'about this Mac > more options' what can i do… help! :(

If you bought your RAM at a place that also sells PC RAM you may have gotten mislabelled RAM. PCs can handle different RAM speeds so they’ll often label higher speed RAM as a lower speed rather than make two different speeds of RAM. But Macs are much more picky. They require a RAM stick to be exactly 667mhz not 675mhz or 800mhz. The way to tell is to put one of your old RAM sticks in and it will force the new RAM to run at the correct speed.
This is from one review of PNY RAM:
"These modules are actually 800Mhz. PNY no longer makes or sells 667Mhz modules. Not all computers that require 667Mhz are compatible with 2 800Mhz modules. They refuse to down clock properly. This is especially true with a number of Core 2 Duo MacBooks. Spoke to PNY support, they flat out told me that yes, they sell 800Mhz modules in 667Mhz packaging. If you RMA a module that is 667Mhz (or supposed to be 667Mhz) they will replace it with an 800Mhz module as they no longer have any 667Mhz SODIMMs, not even for RMA replacement!"

Macbook does not start up

My macbook pro was working fine until when it went to sleep all of the sudden (and never woke up...). The battery is fully charged. I tried to turn it on several times, but no luck. What's wrong with it???

You must tell us more for us to help.
Do you hear the startup chime at boot?
Exactly what do you see on the sceen?
Are there any error message?
Remember you are there with the Mac and we are not. So you are going to have to help us to understand exactly what you are seeing.
Allan

MacBook pro does not start. How can I back to Mac OS X Lion?

I have a MacBook Pro. On my MacBook i made three partition, then I installed window 8. After that I started windos and try to delete third partition by Administrator tool from windows operating system. After that my MacBook does not start. How can I back to Mac OS X Lion?
After that I again install windows 8 from a DVD. Windows start well, but I can not start Mac OS system, may be it was 10.6. Sever times I tried to install OS X Lion 10.7 thought DVD, I could not. On MacBook I have a lot of important data.
What can I do. I want to a complete suggestion. Please help me to solve the problem.
My MacBook Pro model no. A1286.

You installed Windows improperly the result of which was to wipe out the bootloader for OS X. You can give this a try:
Boot Using OPTION key:
1. Restart the computer.
2. Immediately after the chime press and hold down the
"OPTION" key.
3. Release the key when the boot manager appears.
4. Select the OS X disk icon from which you want to boot.
5. Click on the arrow button below the icon.
If you are still unable to boot from the OS X volume then you will need to reinstall OS X:
Reinstall OS X without erasing the drive
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install Mac OS X 10.6.8 Update Combo v1.1.
This will destroy the Windows bootloader so you cannot boot into Windows. The solution is to remove all the partitions on the drive except the OS X partition, then expand the OS X partition to take up the entire drive.
Use Boot Camp Assistant in the Utilities folder to create a Windows partition on which you can install Windows. You cannot have any other partitions on the drive besides these two.
Now given all the above you may be able to install a third-party bootloader that would work with the setup you now have: Boot Runner 1.4.

Computer does not start up

My macbook does not start and a question mark sign is flashed. It does not go beyond that

The question mark means it's not seeing a bootable installation of OSX on startup. Can mean a number of things. Firstly, try starting up holding down the option key to invoke the startup manager. Does it see your HD?
If no, startup with the installation CD in the drive and hold the 'C' key down. It will take a bit longer to boot from the disk, but once done, you'll need to launch Disk Utility and run the Repair Disk routine. Post back.

MacBook does not restart after software upgrade without power adaptor

Hi everbody,
I've done a big mistake while updating my macbook without power adaptor plugged...
After having started the installation, I had many other things to do and completely forgot the installation. So I guess the macbook stopped when the battery had no more power.
The problem is that the macbook does not start any longer, with or without the power adaptor. I've tried the different ways to start the macbook described in the faq, but without success. When I plug the power adaptor, there's no signal and the battery remains very low.
So, if someone has a way to restart my macbook, I'd be greatly happy !
Thanks

I've solved my problem by disassembling and reassembling the power supply.

My 2011 MacBook Pro does not start and stop after the apple appear, they said that the problem is a video problem and need to change the logic board. Cost almost same to buy a new one. Somebody have the same problem?

I have a MacBook Pro early 2011. Does not start. After the apple show, a blank screen appear. The service said that the problem is with the video plaquue in the logic board. Need to change. Cost lmmost the same than a new MacBook Pro. Somebody has the same problem? What we can do?

I hate to break this to you, but life isn't fair. If your job is that critically in need of a computer, then you should have a spare to use for just this kind of situation or have your employer provide you with a computer to use.
Computers break down, just like cars. If your car breaks down do you curse the car maker or get it fixed? Surely, you paid more for your car than the computer.
This is reality. Best get used to it because it won't get any better.

My MacBook Pro, does not start after pushing start button. The side bar starts and stops at half way.

My MacBook Pro, does not start after pushing start button. The side bar starts and stops at half way.

Hy myneck,
Happy Holidays! The resource below may provide some steps to try if your MacBook Pro won't start.
Troubleshooting: My computer won't turn on - Apple Support
http://support.apple.com/en-us/TS1367
This article discusses what to do if your Mac won't turn on. To differentiate this from a display issue, be sure that when you press the power button:
You don't hear a startup chime.
You don't hear any fan or drive noise.
There is no video on your built-in or external display
If your computer has power but doesn't display any video, it may have one or more of these similar symptoms when you press the power button:
You may hear a startup chime.
You may hear fan or drive noise.
You may see a light from the Sleep LED (if your Mac has one).
Pressing the Caps Lock key on the keyboard causes it to light.
If any of these display-related conditions occur, see Troubleshooting: My computer has no video instead. Otherwise, continue with this article.
If your computer won't turn on, try each of these steps:
Verify you have a good connection from your Mac to the wall outlet by confirming the power cord and adapter if present are securely connected and plugged in. To check if the wall outlet is working, plug in a lamp or other electrical device.
If the wall outlet is working and you continue to have no power try another power cord or adapter if available. If it works you may need a replacement cord or adapter.
Note: See Apple Portables: Troubleshooting MagSafe adapters for further troubleshooting with MagSafe adapters.
Disconnect all accessories that are plugged in to the computer, such as a printer, hub, or other mobile device.
If your Mac supports user-installable memory, solid state drive, or hard drive, and you recently installed any of these, make sure they are installed correctly and are compatible with your computer. If possible, reinstall the original memory or drive into the computer to find out if the behavior persists afterwards.
MacBook Pro: How to remove or install memory
MacBook: How to remove or install memory
Mac Pro: How to remove or install memory
Mac mini: How to remove or install memory
iMac (27-inch, Late 2012): Installing or replacing memory
iMac: How to remove or install memory
Reset the SMC.
If you are still unable to start up your computer after trying each of these steps, visit an Apple Store or Apple Authorized Service Provider (AASP) for further diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
I hope this information helps ....
- Judy

My MacBook does not start

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