When pressing ALT while booting the boot menu does not appear

Hi,
as described above I cannot get into the boot menu of my imac.
I press ALT as soon as the sound appears but nothing happens. In fact the screen stays white and OS is not booted.
I have tried that with different devices: USB-stick and CD/DVD. Same result. And I have seen the USB-stick working on my MBP.
I have absolutely no idea why this happens. I have already pluged out all network and usb devices but to no avail.
Somebody an idea how to fix this?
Being a Windows-user most of the time I have no idea how to get this done. Appreciate your suggestions.

You need to press the Option key when restarting.

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