Why is my mac book blank and not loading when I turn it on?

Why is my mac a blank screen when I turn it on and not loading?

Jasmin325<
Also please include your model, year, which OSX you are using, this will help anyone reading this to offer advice.
https://discussions.apple.com/docs/DOC-5431
A couple of shots in the dark here.
Try this, start in safe mode and see if it will go. Power it off, power it on holding the shift key, continue to hold the key till you see a progress BAR, then release and see if it will finish booting. If it does login see if thigs work, then log out and try booting normally. (NOTE that this takes considerably longer,be patient)
Another thing you can try is powering it up holding the OPTION key and see if the start up manager brings your HD up on the screen, if it does click on that and see.

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Go to users and groups and choose only your iCloud Contacts to display.
Ensure that nothing is typed in the search field.
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Drag the list of contacts to your desktop.
Make sure your On My Mac account is your default account (preferences > general).
Select All On My Mac contacts from users and groups.
Drag the file you previously dragged to your desktop back onto Address Book.
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OK, Thank you.
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If you mean that it just shuts off without any warning, then this might help:
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Otherwise it needs to be fixed.

My mac book safari always not responding when i klic on sidebar

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Jasmin325<
Also please include your model, year, which OSX you are using, this will help anyone reading this to offer advice.
https://discussions.apple.com/docs/DOC-5431
A couple of shots in the dark here.
Try this, start in safe mode and see if it will go. Power it off, power it on holding the shift key, continue to hold the key till you see a progress BAR, then release and see if it will finish booting. If it does login see if thigs work, then log out and try booting normally. (NOTE that this takes considerably longer,be patient)
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Why does my Mac stay on the white screen when I turn it on?

Why does my Mac stay on white screen when I turn it on?

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
Sometimes a boot failure can be resolved by resetting the NVRAM.
Step 3
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 4
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 5
Boot in safe mode. Note: If FileVault is enabled on some models, 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 corrupt and the drive is probably malfunctioning. In that case, go to Step 6.
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 6
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 7
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.
Step 8
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 Time Machine or other backup.
Step 9
This step applies only to older Macs (not current models) that have a logic-board ("PRAM") battery. 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 boot 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 10
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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Hopefully the advice of diagnosing the drive using the system CD will bring you good results. However (as you can see if you browse the forums) there have been quite a few reports of non-recoverable hard drive failures which seem to relate to certain Seagate HDD models as per Retrodata's MacBook-Seagate HDD failure announcement.
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What system are you running on your Mac? Does it meet the requirements listed in this Apple doucment: iCloud: System requirements
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Hi
I have tried all sorts to fix this. The obvious resetting, rebooting etc of the router. I have spoken to my provider and stuff.
My internet on my iMac is terrible. I turn off wifi and back on and it works for about 20 seconds then stops. Very intermittent and hardly ever fast.
My iPhone however loads pages and apps that use the internet instantly. I am sitting at my computer so i cannot see why there would be a difference!
Its making my head hurt
HELP

Use the 5GHz Band Compared with the 2.4GHz band, the 5GHz band is practically empty. The newest AirPort Extreme Base Station is one of the few Wi-Fi base stations designed for home use that work in that 5GHz band. All of Apple’s Core 2 Duo laptops and iMacs (except the discontinued 17-inch 1.87GHz model) can also use the 5GHz band; with the build-to-order wireless option, so can the Mac Pro.
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Currently, no Mac-compatible adapters enable you to use the 5GHz band in older Macs or with older versions of OS X.
WiFi update 10.7.3
http://support.apple.com/kb/DL1501
Apple DNS Servers:
208.67.222.222
208.67.220.220
Wireless Improvements
Move the Base Station If interference is particularly bad in one part of your house or office, move the base station to another location. But this can be tricky if your AirPort base station has to connect to the broadband feed coming into the house and that feed happens to enter at a particularly interference-prone spot.
I have no way of testing some of these Firmware updates, read through them and see if any might apply to your system.
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Why is my mac book blank and not loading when I turn it on?

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