IMac wont respond after boot. Bad softwareupdate on may 17. 2006?

After using Software Update this morning with several updates, including security update and firmware update (SMC).... my iMac stops responding appr. 30 sec. after boot. I can move the mouse arround, but keyboard and mouseclick doesn't work. Anyone else with the same problem?
The problem started after software update but BEFORE the SMC update.
Any suggestions ???? Please help!

I have the same issue and tried all the things suggested here, and here:
http://docs.info.apple.com/article.html?artnum=106464#symp1
and here,
http://docs.info.apple.com/article.html?artnum=106214
but it still leaves me with a blue screen on startup. Any other suggestions?
Thanks!

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