Mac screen is black
My iMac screen is black when I turn the iMac on
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My iMac screen is black when I turn the iMac on
Please follow all of the steps at > If your Mac starts up to a blank screen - Apple Support
If those do not work, then you need to contact Apple Support and/or make an appointment at your local Apple Authorizes Service Provider.
That does suggest a dead display, or at least a dead backlight.
Alternatively, take it to an Apple Store or AASP for diagnostics and/or repair.
Which iMac do you have, and what version of MacOS is installed?
Do you hear a startup chime?
If you connect an external monitor do you see anything on that?
Yes I hear the chime so I know it's on but the screen stays black
Mac screen is black