How do I boot Mac Mini when 'c' or 'command' 's' doesn't work

I recently reinstalled OSX 10.4.7 and OSX Leopard 10.5 upgrade. It appears that when inserting my name and password during the installation I must have miss typed something as when trying to update and install software the computer now asks for my administrator name and password which I cant get right.
I have tried inserting the Mac OS X Install disc while pressing ‘c’ to boot the computer  from the installation disc, however the computer appears not to recognise the ‘c’ command and opens the computer from the hard disc instead.
I have also tried to book the computer while holding 'Command S', but also here the computer merely starts up from the hard disc as normal.
I have tried my Mac (Danish) keyboard and a (UK) Mac Keyboard from Work with no difference.
I can change my Mac user name and password without problems under accounts, (forgive me for my ignorance) which I now assume must be different form the administrator account?! I am at a loss. I am certain I am writing the name and password I put in during the installation but must non the less have forgotten a detail in it.
Can you help suggest how to gain access to update and installing software again.
Sincerely
Ib, Edgware in London

Hello,
Might you have setup Firmware password protection in Mac OS X ...
http://support.apple.com/kb/HT1352
It would block usage of all the startup keys, like C, N, T, D, CMD+s, CMD+Option+p+r, CMD +v, Option, and Shift, as well as booting from anything but the Hard Drive.

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