I recently booted up my iMac, but then the Apple logo disappeared and a🚫 replaced it. I tried going into Recovery mode but recovery mode just takes LITERALLY hours. No matter how long I let it load, recovery mode doesn't help: I let it load overnight and it still didn't work.
How can I fix this issue and boot into my iMac again?

@owlswipewith more detail and I'll reopen this question. – owlswipe Jan 16 '17 at 19:11