Have been restarting imac due to sbbod but now computer will not restart.  Wheel under Apple logo just continues to spin. What do I do now?

After every minute or so of use, I get the SBBOD.  Until now, I have been able to restart computer to try to work on problem.  But now the computer won't even start.  The wheel under the Apple logo just spins.  I did hardware test before and it was fine.  Now what?

Try a Safe Boot. Hold down Shift at restart and give it much longer to boot. Leave it a while there without opening anything; then restart normally, but don't open anything for a few minutes. Then slowly open applications you use until you see at what point the SBBOD returns.
Check to see how much CPU is being used in Activity Monitor in Utilities.

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