Late 2013 27" IMac slow at bootup


hey guys

several months now, have been experiencing slow boot times late 2013 imac. upon powering up, stays in blank state approx 10 - 15 secs, before making chime.

have external hdd connected , external dvd drive hooked up. has experienced issue before!
 

what imac booting from, internal drive?

if booting external selected boot drive in system preferences > startup disk? try removing external dvd , checking if set open in login items > users , groups in s.p.
 


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