Start up screen blank with apple sing and circle

Since the time I downloaded Lion software over the net , my macbook pro takes too long to boot at start up . But now it doesnt even start ,it just goes blank with the apple sign and crcle underneath trying to boot but it doesnt do anything after I power on . Can plz somebody help

Hi ...
Use Lion Recovery to repair the startup disk of if necessary, reinstall the Mac OS X.

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    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.
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    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.
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    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.
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    If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
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    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.
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    If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
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    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.
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    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.  
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    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
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    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.

  • When turning on my mac book pro it displays a screen with apple logo and begins loading a loading bar, after this continues to show loading circle however has been like this all day still no different. Tried turning it on and off however still same!

    When turning on my mac book pro it displays a screen with apple logo and begins loading a loading bar, after this continues to show loading circle however has been like this all day still no different. Tried turning it on and off however still same!

    ... then run Disk Utility, Repair Disk.
    Also:
    Resolve startup issues and perform disk maintenance with Disk ...
    Mac troubleshooting FAQ: start-up woes
    How To Fix Common Mac Startup Problems
    Mac Stalls on Gray Screen at Startup - Troubleshooting Mac Startup ...

  • I get a white screen with apple logo and progress bar on my imac mavericks

    I get a white screen with apple logo and progress bar ,then computer shuts down
    when I turn my imac back on same thing happens,every time same thing
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    if not is there a way to at least salvage some files and docs?
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    Thanks I tried it but after I repaired my disk via disk utility at start up, it told me that
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  • Iphone stuck with apple symbol and wont start up

    i updated my iphone and when it finished and went to reboot it just stays stuck on the apple symbol it constantly reboots and will never connect to my laptop i dont know what to do if anyone can help please do

    Hi,
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    2. Disconnect the USB cable from the iPhone or iPod touch, but leave the other end of the cable connected to your computer's USB port.
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    If you are still unable to restore the iPhone using this method, check Apple support for further troubleshooting and/or service options.
    Note: If you sync both an iPhone and an iPod touch to the same computer, make sure you select the correct backup to restore your settings from (don't select an iPhone backup if you have an iPod touch and don't select an iPod touch backup if you have an iPhone).
    **** ( BACKUP FROM YOUR iTUNES : MAC/PC; AS I GOT MY 95% DATA FROM THERE.... GOOD LUCK)******* IF IT WORKS PLEASE POST YOUR EXPERIENCE....*
    THANKS

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