Aluminium Extended Keyboard and Wireless Keyboard Problems

Hi
I'm having problems with both keyboards. I have repaired permissions and repaired the disk.
I can't use the keyboard to invoke the Hardware test from the second installation DVD when restarting (holding done the D key), nor can I boot of the first installation DVD by holding down the C Key. Likewise, neither keyboards permit the pRAM to be zapped.
Holding down the Option key when restarting has no effect.
When typing, some keyboard characters and the function keys just won't work on the wireless keyboard. For example, on the extended keyboard I am using now, I can't type a capital t.
the only way to boot from the installation disk, is to select it as the start-up disk in System Preferences.
the login screen does not allow me to type in the password first time around. it just keeps adding bullets, e.g. •••••••••••••••••••••••••••••••
the only way to get around this is to press enter, let the login window shake itself, and try again.
I think this is a software / firmware / driver problem. Perhaps it is related to the 10.6.8 update? the keyboard problems have only started happening today.
My wife said she had to stop everything the other day, because the iMac demanded (out of the blue) that a restart was required. She could do nothing but restart the iMac.
Without a fully functioning keyboard, the computer is not much use!
Any ideas?

Your wife's remark indicates a KP. See
What is a kernel panic,
Technical Note TN2063: Understanding and Debugging Kernel Panics,
Mac OS X Kernel Panic FAQ,
Resolving Kernel Panics, and
Tutorial: Avoiding and eliminating Kernel panics for more details.
However, if you can't access anything with the keyboards, then your best bet is AppleCare's Express Lane.

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