iMac won't reboot beyond apple logo


the day after installed el capitan on imac (2010), not boot beyond apple logo. held down command , r , did repair disk didn't show problems. reinstalled el capitan , fine. next day same thing happened. , next day. so, i've put computer sleep instead of shutting down. el capitan problem?
 

i having same problem.
2009 macbook pro, stuck @ grey apple loading screen, loading bar half loaded.

it's happened me before, frozen, did shut down mac, , restarted , worked nothing happened, not time.
 


Forums Macs macOS OS X El Capitan (10.11)


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