Keys don't work on startup

Hello.
I've got a problem with my iBook.
I want to reset the PRAM and press Applealt+pr while startup, but nothing happens.
Then I insert the Hardware-Disk an pressed c while startup, but: nothing happens!
What coult this be?
Thank's for your help,
Björn.

With the computer off, press and hold Shift-Control-Option-Power then release them. Be sure not to press the fn key while doing this. If the computer isn't connected to the internet, you'll need to reset the date and time (this is a good way to check if the PMU was reset).
If you click on PMU (in blue) in my previous post you'll be taken to the KB article that describes the resetting procedure. Don't be concerned with the warning about RAM discs, OS X isn't capable of creating one.
John

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