New iMac 24": 2.8Mhz Password not accepted after upgrade to Leopard

I bought last week a new 24" iMac and after installing the Leopard upgrade with the disc that came in the box my password is not working anymore. I can't even run the Mac OS X install disc with the C key at restart and cannot restart the system with command-s. Any suggestion?

Exact same problem here...

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