I have uninstalled windows but now my imac doesn't start up properly

After experimenting with boot camp I have removed windows and repartitioned my hard drive. Every time I start my mac up now I have to hold the option button and select macintosh otherwise the screen goes into a kind of ms dos mode and says "No bootable device - insert boot device and press any key."

you still have to go into System Preferences => Startup Disk control panel to set the default boot volume

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