When I get to the login page on my macbook, I type in my password and it starts to load, but then the screen turns blue and it goes back to the login. What should I do?

I was having some problems with my mac, safari and itunes was freezing alot. I have to force shutdown and when I tried to start up again i get to the login page, type in my password and it starts to load, but then the screen turns blue for a few seconds and it goes back to the log in screen. What should I do?
Please Help!!

Somewhat similar problem:
Put in the password, hit enter, the screen goes blue for half a second, then goes back to login screen and carries on logging in as usual.  Drives me mad.  It doesn't happen with a fresh Lion installation, nor if booted into safe mode.  On the machine in question it also happens to new user accounts.
I've removed all login items, including Startup Items and Launch Demons (pun intended) and Agents, I've compared system login plists with a fresh Lion installation - can't see differences.  I've removed Little Snitch and PeerGuardian (no more third party kexts).
@Carolyn: I've done disk maintenance with DiskUtility and fsck and even DiskWarrior, cleaned caches, etc. etc.
Any ideas would be gratefully received.
Sorry for trying to hijack the thread (as it's not about Lion), but it seemed dead anyway.

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    When I get to the login page on my macbook, I type in my password and it starts to load, but then the screen turns blue and it goes back to the login.
    Iv tryed this numerious times still keeps going back to pasword. Can not get any further. Tried restart holding shift key.. still nothing. What do i do?

    Thank you for your help.
    I couldnt get to the hard drive/ desktop. Soft login not even working. So i could not do any of that.
    In the end i took it to Apple and its actually the hard drive on its way out. A common issue with that series of Mac. Funny seeing i dont use this mac much. However being 2.5 years old and out of warrently, Apple have recognise this issue with this series/ Model and installing a new hard drive at no cost.
    Very luck and greatful. And not feeling so dumb that it was something i did or could troubleshoot myself.
    Hope this helps others that it just might be your hard drive failing.

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    Crashes Since Last Report:           29
    Per-App Interval Since Last Report:  981 sec
    Per-App Crashes Since Last Report:   25
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    19  com.apple.AppKit                        0x00000001015f61d9 -[NSWindowController showWindow:] + 47
    20  com.apple.AppKit                        0x00000001015c7c5c -[NSDocument showWindows] + 98
    21  com.apple.AppKit                        0x00000001015c64bb -[NSDocumentController openUntitledDocumentAndDisplay:error:] + 340
    22  com.apple.AppKit                        0x00000001014f7b44 -[NSDocumentController(NSInternal) _openUntitled] + 111
    23  com.apple.AppKit                        0x00000001014f79ab -[NSApplication _doOpenUntitled] + 257
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    27  com.apple.Foundation                    0x0000000100ffcf06 _NSAppleEventManagerGenericHandler + 114
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    29  com.apple.AE                            0x0000000104d73224 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 32
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    31  com.apple.HIToolbox                     0x00000001028a0619 AEProcessAppleEvent + 48
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    34  com.apple.AppKit                        0x00000001013c168f -[NSApplication run] + 395
    35  com.apple.AppKit                        0x00000001013ba3b0 NSApplicationMain + 364
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    2   libSystem.B.dylib                       0x0000000100a297b4 _dispatch_queue_invoke + 185
    3   libSystem.B.dylib                       0x0000000100a292de _dispatch_worker_thread2 + 252
    4   libSystem.B.dylib                       0x0000000100a28c08 _pthread_wqthread + 353
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