Start up chime every 3 seconds - Cannot boot
I tried re-installing High Sierra but forgot to wipe the HDD.
After rebooting and trying to re-install with a wipe, the imac turns on, plays the start up chime, then every 3 seconds later it will play the chime again. The screen is white/grey (hard to tell as the brightness seems to be all the way down)
It is not chiming every 5 seconds .
No keyboard commands work. It is like its stuck in a loop.
Tested other keyboards.
Any ideas on how to fix this issue?