I am trying to reinstall OS X Lion

So my macbook pro was stuck on the start up screen and because of this I am trying to reinstall OS X Lion so that it can start up. It (Mac OS X Utilties) says
that my Macintosh HD and Recovery HD disks are locked. Is there a way to bypass this lock?

Cornfields wrote:
So in #3, you metion the Parition button, where exactly is that; also what is the mfgr.'s ID and size?
I think Kappy is incorrect with information for OS X 10.7-10.8 which the entire drive is actually named disk0.
For Snow Leopard and earlier the name of the drive maker and it's size is the one to select when selecting the entire drive for formatting.
Also I think he missed your question because that doesn't solve your issue.
So my macbook pro was stuck on the start up screen and because of this I am trying to reinstall OS X Lion so that it can start up. It (Mac OS X Utilties) says that my Macintosh HD and Recovery HD disks are locked. Is there a way to bypass this lock?
Ok, first of all, you DON'T have to use Disk Utility to erase the drive for your problem and reinstall OS X, that's a last ditch effort.
OS X can be reinstalled over itself to fix it without touching most of your programs and none of your files.
It's only if there is drive corruption that the MacintoshHD partition (section on the drive) or the entire drive will need to be erased and reformatted (all data is gone)
You mentioned a "stuck on the startup screen" issue.
Can you describe what your seeing?
Are you the owner of this machine or is it managed by someone else? School/work etc.
Have you held down the Shift key on a wired or built inkeyboard while booting to enter Safe Mode?
Can you backup just your users files to a external storage drive (not TimeMachine!)?
Can you follow further instructions?
..Step by Step to fix your Mac
Tell us what you see and what you have accomplished, if you were or have a recent backup of your files off the machine or not.

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