Macbook Freezing at Login Screen

I have a Macbook running OS X 10.6 that "freezes" at the login screen. The system will turn on normally, but when the login screen appears the mouse and keyboard do not allow any of the options to be clicked. I can move the mouse but can't click on anything. After forcing shutdown and restarting about 5 times it finally allowed me to log in, but it froze shortly after logging in. I noticed a few times that if I wait long enough after clicking on a user it will eventually log me in...I"m thinking it's possibly a hard drive issue? Any ideas?

Here's what I've tried so far...

-USB Mouse (same results)
-Safe Boot (same results)
-Apple diagnostics show everything is OK

Since it is 10.6 I believe I would need the disk to get into Disk Utility, but any suggestions or ideas as to what might be the problem would be great. Thanks!
ttotusAsked:
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strungCommented:
You should first try running Repair Disk from Disk Utility while booted from the system DVD. That will likely solve your problem.

If you don't have a system DVD, start in single user mode and run fsck following the instructions here:

http://support.apple.com/kb/ts1417
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OxygenITSolutionsCommented:
Could be a memory issue. Try booting with one module out. Then swap with the other.
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ttotusAuthor Commented:
Thank you for the responses. I have tried the memory suggestion and I had the same results swapping out both RAM sticks. What's strange is it does seem to work eventually of you wait long enough. Like the drivers aren't starting or are delayed...
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OxygenITSolutionsCommented:
If it starts I would try this. Install App Cleaner. Drag any apps you no longer need or use. Check start up items in System preferences. Run Repair Permissions. Make sure you clear out your Blue Tooth devices. (you can always re-add them).

REF:
App cleaner - http://appcleaner.en.softonic.com/mac
Disk Util - http://guides.macrumors.com/Repairing_Permissions
Preferences - Users and Groups - Login Items

After that, I'm spent!!
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strungCommented:
Did you repair your hard drive? That is the most likely problem.

Also check to make sure your hard drive is not full.
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ttotusAuthor Commented:
Hi Strung,

Hard drive showed SMART diagnostics were ok. I ran verify disk with the same results as well.
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strungCommented:
I assume you checked to make sure the drive is not full.

Once you are booted have a look at the console logs to see if there are repeated error messages.
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ttotusAuthor Commented:
I will check the error logs. It has 32gb free. Thank you
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ttotusAuthor Commented:
I have replaced the hard drive, and tried to boot from disc. It will not boot from the Leopard disc. It will also not go into diagnostics anymore. I have tried replacing the hard drive and the RAM. Same results. I'm thinking mother/logic board is responsible.
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ttotusAuthor Commented:
It was the logic board.
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OxygenITSolutionsCommented:
In Australia. Macs carry a two year warranty despite Apple only telling you it's one. Hope this helps in some way.
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