iMac HDD Replaced, startup shows image with a switch on <image added>
replaced HDD now when started the screen shows an image off a switch seems to be indicating i need to move the switch!
Martin - The image is of your mouse (the mouse you linked via Bluetooth to your system), not your system its self.
Either your mouse is turned off or the batteries are dead within the mouse. If you have a USB mouse you could connect it to your system to then turn off the mouse in the Bluetooth settings in case you don't have it any more.