iMac Won't Boot Up

my imac getting stuck @ white apple logo screen , won't go further. i've tried smc reset , pram reset, , neither worked out me. it's getting me frustrated because need type essay >.<

 

have tried of these steps?

mac doesn't boot

resolve startup issues , perform disk maintenance disk utility , fsck

troubleshooting: computer won't turn on

a flashing question mark appears when start mac​

 

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