Blue screen and no login at start up after 10.6 install

After installing 10.6, I am not able to log into my MacBook Pro, unless I do so in safe mode.
I get passed the grey apple/boot up screen, then rather than having the list of users, I just get a blue screen (the mouse is there).
I have tried the following:
1. Booted from external drive and repaired permissions.
2. Logged into safe mode and deleted all start up items.
3. Reset the PRAM ect.
4. Removed all items from the "startupitems" folder within library.
5. Tried fresh install.
Any other suggestions?

Hi acl2009 & welcome to discussions.
1. Booted from external drive and repaired permissions.
Not recommended if that happened to be an older OS version - only use the version of Disk Utility that comes with SL. Boot from the installer DVD and use DU from there.
Any other suggestions?
Take your laptop and your SL DVD into the nearest Apple Store and ask the staff there for assistance...

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