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My iMac computer boots up and has a circle with a line through it
Before going the full blown re-install route, I would first try resetting the NVRAM and then Safe Mode.
to reset the NVRAM, see > Reset NVRAM or PRAM on your Mac - Apple Support
then > Use safe mode to isolate issues with your Mac - Apple Support
This may help:- https://support.apple.com/en-gb/HT204156
Try starting whilst depressing the 'Command' and 'R' keys and reinstall your operating system.
Good luck!
How do you fix the iMac when you put it up and it has a circle with a line through it
