Macbook Pro not Booting Properly 50% of the time.

I have a 3 year old Macbook Pro 13.3 Inch that I use for school. However over the course of the last 6 months it has begun to only boot up fully into OSX Lion about half of the time. The other 50% of the time it "freezes" during boot up and although I can move the mouse around the home screen, I cannot do anythign else besides do a forced shut down and reboot by holding the power button. Everything LOOKS like it loads except my IDISK icon, If the IDISK does not show up, then I know the computer did not fully boot, Howver If i can see my IDISK on my desktop, the computer is fully booted and works fine. Ive looked online for others having this same problem, and I have done a full wipe and reinstall from my time capsule with no luck, same problem. I have not found any threads like this and the guys at the Genius Bar had no idea how to correct it, any ideas?
Do I need to completely wipe the drive and partition and start with a fresh copy of LION that is NOT from my time capsule? If I do that can I retrieve certain things off of time capsule?
Any ideas would be helpful, the computer runs perfectly except for only booting 50% of the time.
Thanks

Lion on to old of a machine is likely your cause, revert back to Snow Leopard
How to revert your Mac to Snow Leopard

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Hi there
I'm having some issues with my (late 2008) MacBook Pro after installing a recent software update: the machine is not booting up, instead displaying the 'prohibited' symbol on the grey bootup screen, thus:
!http://img828.imageshack.us/img828/7215/photovl.jpg!
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Thanks for that, I did go looking for it but couldn't find it.
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Last night I was using my Macbook Pro, closed the lid then came back later and when I opened the lid it wouldn't wake back up. Shut it down by holding the power button, then tried booting it back up. You can hear the CD/DVD drive spin up, (got my copy of X-Plane in there) but nothing else happens. Keyboard backlights never turn on, display stays dark, and the sleep light never lights up all the way either, just stays dim. Leave it for a few minutes, then close the lid and the sleep light gets bright like the computer is awake, and you can still here it running.
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Here's a link to the NVIDIA program:
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Hi all,
So I am having major issues with my mid 2009 MacBook Pro. I will try to be as concise as possible and any, ANY input wil be greatly appreciated.
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Macbook pro not booting after software update

Dear all,
Since two days ago my macbook pro hangs at the gray apple screen, the round circle keeps on turning. Kept it running for nights but it does not exit this status. I read on the internet that I could run it in verbose mode, that's what I did, see screenshot below. What do you recommend? This seems to be a hard disk issue. How can I boot up in safe mode and possibly recover the hard disk data? Any other recommendations?
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Get your Mac to a Computer repair service, or do it yourself. You will need to put it in an external SATA reader, like I did. I recovered files via an older mac running Slow Leopard and copied files to it.
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Highwaytohells wrote:
Hi,
I own a Macbook pro 13 inch since about 3 years and
snip
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Macbook Pro not Booting Properly 50% of the time.

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