Kernel error as soon as i press a key on my usb apple imac keyboard

Kernel error as soon as i press a key on my usb apple imac keyboard

Am typing this on my laptop, as soon as I press 1 key on my apple imac
keyboard, the imac freezes then instantly restarts with a box popping up
saying ' your computer was restarted because of a problem. Everything
workd fine until I press 1 key on my keyboard. Anyone got any ideas of the
problem?