iMac boots to blinking cursor after changing boot partition I have an old iMac (2009) and I've been digging through to make sure there's nothing we want to keep before wiping it to sell. Once upon a time it had dual boot through Bootcamp. I was looking at the partitions in recovery mode and noticed that it still had the bootcamp partition. If I recall correctly, I managed to set it so it would boot to that partition (I was curious to check that there was nothing we wanted to keep)
After restarting, it makes the start up chime on a light grey screen, doesn't show any logos, then goes to a black screen with a blinking cursor. I can't get it to boot into recovery now using the usual means.
How can I get it to boot correctly again? I've done nothing else to it, so the OS should still be there.
It was the keyboard. For some reason using a PC keyboard wouldn't bring up the boot options when pressing the equivalent of the option key.