My macbook will not reboot?

I had to force shut down my macbook and now it will not reboot. After the login window I get a grey screen with the spinning gear and nothing else happens. I have tried to start in safe-mode to no avail. I restarted with Command R and have tried Disk repair, restore to a previous version and reload OSX, nothing has work. The only thing I can do is get to the Safari window to use the internet. Please help before I purchase another computer. Computer skills and patience at a very low level. Thanks.

Is your MacBook older, say pre-mid-2011 or newer? Or put another way, did it come with OS X 10.7 Lion or OS X 10.8 Mountain Lion?
When you boot to the recovery partition, and bring up Disk Utility, when you clicked the first aid tab and Repair Disk, did you do that on the volume and/or the partition? The volume would be the left-most entry, with the partition indented below that. You can repair both. Did you try repairing both?
It's too early to say that the hard drive has unrecoverable issues. Typically, when there are hard drive issues that Disk Utility can't repair, the next step is Disk Warrior (assuming there's not an obvious hardware issue). Some use TechTool Pro, but Disk Warrior has been the greater tool of choice for disk repairs.
If you can, it would be good to run the Apple Hardware Test. If your MacBook came with OS X 10.6 or prior, you have the original OS X disk to run the hardware test (the disk that says in small print on the label 'AHT Version x.x' is the one to use). If your MacBook came with Lion/Mtn Lion, you didn't get any DVD's, and should follow the steps in the Apple note. If you're able to run this, it will help determine whether there is a hardware issue with the hard drive. If not, then Disk Warrior can likely fix the drive. The hardware test can take over an hour, depending on how much memory you have installed.

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Macbook will not reboot

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You need to be more specific than "I have tried recommendations from forums".
First, which MacBook do you have running what operating system?
What happens when you try a normal boot? Do you hear anything? See any video?
What happens when you try a safe boot, by holding the shift key down when you boot?
What happens when you boot to your OS X DVD in your system, by holding the C key down when you boot? If you're able to do this, what happens when you run Disk Utility on your hard drive?
Are you able to run the Apple hardware test?
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After updating from Lion 10.7.4 to 10.7.5, my MacBook Pro will not reboot. Why? What can I do about it?

After upating from Lion 10.7.4 to 10.7.5, my MacBook Pro will not reboot. Why? What can I do about it?

I ended up having to visit an Apple Store. They claimed that the update must have aggravated an already corrupted hard disk drive. The solution was to wipe my hard disk (fortunately I had recently backed up on Time Machine). The "Genius" also claimed this was the first time he had come across the problem. Although he was clearly able to diagnose it straightaway, and the next person he saw had exactly the same problem with his Mac, and I saw an awful lot of customers queuing up with their Macs and iMacs looking very suspiciously like they all had the same problem! So clearly Apple know what the problem is but as usual treat customers as if they're idiots in order to cover up the problem. But at least the problem is now solved (although having to take at trip out and wait in a queue at an Apple store, and then restoring from backups is a painstaking inconvenience I could well have done without). All I can suggest is that you might as well take it in. None of the "solutions" on the Forum are remotely on the ball, and all Apple "Geniuses" have clearly been told what the problem is and how to fix it. Good luck!

MacBook Pro 13" Retina will not reboot in Yosemite

I have a brand new -- the newest model -- MacBook Pro 13 in. Retina that was doing well with Mavericks. After having Yosemite installed it froze up when the top was closed, and now it will not reboot.
I tried holding the power button down for several seconds and then pressing the power button again, just long enough to get the start-up gong. Tried this three or four times. Each time the reboot stops when the progress bar on the screen, under the Apple logo, reaches just less than half way. Then nothing. Letting the machine sit for long periods while it works out its own problems does not help. No progress toward rebooting.
I have tried rebooting with and without the power cable attached.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the 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 the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from 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.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start 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.
d. 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
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up 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.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start 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 the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up 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, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup 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 restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the 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 restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

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My Macbook will not boot the operating system. It just goes to a blue screen after the apple logo and the spinning wheel goes off. I took the battery out and held the on/off button for five seconds and reset the PRAM. I have the old mac os disk.

My macbook will not boot. It goes to a blue screen after the logo and wheel goes off. I have taken the battery out and held the on/off button for five seconds and reset the PRAM. I have the the original os disk but have not put it in for fear of losing un backed op data.
Thanks
Rich

You won't lose any data unless you erase your hard drive.
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Macbook Will Not Start Up

My Macbook will not start up
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Well i never did try the command option p r combo, but have now and makes no difference.
and the macbook dosen't work again.
sometimes it sounds like it wants to boot, the HDD spins up and the optical drive makes a noise but no screen and no chime.
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Logic board fail ???

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Help here: http://docs.info.apple.com/article.html?artnum=303319
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Try this ..
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"Try Disk Utility
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My macbook will not reboot?

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