Blue Screen loop

Powered up my MacBook Pro this morning and it's stuck at a blue screen. Screen appears to pulse between two shades of blue with the mouse pointer appearing and disappearing every 30 seconds or so.
I've booted off the Leopard DVD and run disk first aid. No real problems found and a couple of dodgy permissions fixed. Safe mode seems to work, however when I try to logon the wallpaper disappears then I get the blue screen again and it dumps me back at the logon screen.
I've got a time machine backup that's a couple of days old if it helps.
Any suggestions, or do I need to archive and re-install?

Here Here!!! Magicboy's pointer to the com.apple.launchservices files just saved me a ton of reinstallation work. After trying countless other repair techniques, I was within a few moments of biting the bullet and doing a complete system reinstallation when I thought to do a search on these forums. Deleting the files got my system booting again. Thanks!!!
A tip to others - I always keep a spare portable drive with virgin installs of the most recent two OS releases (in this case, 10.4.11 and 10.5.6) plus drive repair software for use in just this kind of situation. I was able to boot from this emergency drive and easily delete the problem files from my startup drive. USB thumb drives are plenty big and inexpensive enough these days to serve this purpose without need for a drive+enclosure.

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    Alexroet wrote:
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