Can't boot with the Leopard disk

Hi,
I upgraded to 10.5.7 from 10.5.6 and after 2 or 3 reboots and I can't get to leopard (I only see a blue-screen that does not dissappear). I reset everything, but I still can't boot into Leopard. To make things worse, I am trying to boot from the Leopard disk to do a clean install and fix that problem, but I can't because it also gets through the blue-screen and never dissappears. How can I make the Mac to boot into Leopard disk 'cause I've been like 2 or 3 days trying to figure it out.
Also...Can I fix this using target mode and formatting the HD with another mac?
Thanks in advance.

HEy!!
Finally, after a nightmare I could succesfully restored my Mac!!!.
I was really desperate, so, after talking to a friend who knows this stuff very well, he told me that all that was left before taking it to the Apple Store was to do some maintainance with it. He told me to buy Drive Genius 2.0 and run every single maintainance tool the software had. So I did it, and magically I could boot into Leopard and reinstall the OS again1!!!!. Even I could fix some video-graphics problems that I had.
All of these because I upgraded to 10.5.7. Right now I'm running perfectly fine with 10.5.4.
Thank you guys for helping me out!!. If you have this problem you could try Drive Genius and maybe you can get out of trouble easily!!
Message was edited by: Neonrx07

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