Failed boot after update - White screen after bong

Hi, i've an iMac with snow leopard installed.
Yesterday i did a software update that included a reboot.
after that and after the standard boing the system stopped on a white screen.
I've tried using the snow leopard dvd, nothing, pressing "c" with the dvd, inside, nothing, pressing alt, nothing, pressing Shift, success!!!
The system normally logged in but after a new reboot, that i've decided, the system stopped again on the annoying white screen.
I've tried again pressing shift but now anything happened!!!
Help me please!!!
thanks

Solved!
I unplugged the ac and waited for 20 second.
After that i rebooted pressing altcmd+pr. After the second boing the system rebooted regularly.
Then i re-installed snow leopard.
Now it's ok,
thanks to everyone.

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