Macbook Pro Frozen, will not boot up

Hi,
My MBP is continually freezing and it seems to only happen while Safari is running. I reset Safari, cleared history and it worked better for a short time. My notebook is now frozen and will not boot past the gray start up page. After the Apple icon appears the desktop goes to all gray and I cannot do anything. I am nervous to continue the hard reboots (manually holding the power button.) I cannot have any hard drive errors. This is a mid 2011 model Macbook Pro. Any advice?
Thanks!

Reset SMC like this:
Intel-based Macs: Resetting the System Management Controller (SMC)
Barry

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HT3964 I have a MacBook Pro that will not boot up. The apple symbol Read more: I have a MacBook Pro that will not boot up. The apple symbol is there and a spinning wheel continues to spin. Any options??

I have a MacBook Pro that will not boot up. The apple symbol is there and the spinning wheel keeps spinning. Any idea how I can fix this?

Reinstall OS X.
Reinstalling Lion/Mountain Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. 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 main menu.
Reinstall Lion/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
OR
Reinstall Snow Leopard without erasing the drive
Do the following:
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 the Combo Updater for the version you prefer from support.apple.com/downloads/.

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accuracy_101 wrote:
Can you inform me on how to format the new hard drive once I receive it?
You will have to connect the new HDD to the MBP via USB (you will need to install the HDD in an enclosure).
Boot into the recovery partition.
Select Disk Utility from the 4 option menu.
Open Disk Utility>Erase, select the new HDD from the left hand column and select Mac OS Extended (Journaled) as the format and click on the erase button.
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Try a SMC reset
https://support.apple.com/kb/HT3964
What color was the screen, black or grey?
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https://support.apple.com/kb/ht1509
Your signature says you have OS X Lion, if you need to enter the Lion Recovery Partition and perform repairs in Disk Utility, you need to hold Command R keys while booting.
https://support.apple.com/kb/HT4718
It's possible that your firmware was updated and won't allow you to "hold c boot" from earlier OS X install disks which you really don't want to do anyway with Lion.
There are no boot disks with Lion, but you can make some from option clicking on the Purchases, downloading the Lion installer again and follwoing these directions.
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Macbook Pro Frozen, will not boot up

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