start up problem imac 27

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bertil linke

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what to do when the screen try to start up in the top there is coming a line with different colurs and the apple logo is also there?? and after just turn grey screen
 
honestone

honestone

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What exact Mac OS are you using?

And, what exact iMac model do you have?

Also, have you been making any backups to an external device?
 

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