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Modelo A1312 / Mediados de 2011 / Procesador Core i5 de 2.7 & 3.1 GHz o Core i7 de 3.4 GHz

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iMac only starts on external screen after cmd option p r

When I disconnect the internal screen the Imac starts only after cmd option p r after 2 chimes on a external screen When I connect the internal screen nothing happens. Cmd option p r only chimes once. The external remains black. The fans are rotating. I put in a new SMC battery.

So I think the videocard is ok, as well as the power supply. 16 Gb RAM and a Intel 5 processor. Who can help?

Contesta esta pregunta Yo también tengo este problema

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Given the fact you are disconnecting and reconnecting the internal display and seeing a difference in the systems reaction its more likely the display has a problem.

Check the cable connections for damage are you making sure the cable connector is not shorting out. You also have a set of on-board diagnostic LEDS what are they telling you?

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Diagnostic LED's

Update (12/14/2021)

@Jj Dallinga - So #4 doesn't light up with the cables connected correct? If thats the case the displays T-CON board has a short.

Underneath the backside metal shield you’ll find this board

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Inspect it for burnt markings around the caps and coils.

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3 leds are lit. I find it strange that when I disconnect the internal display I need to do cmd option p r to get the external display running. Cable connections of the screen are ok

- de

@Jj Dallinga - You'll likely need a new display assembly

- de

Ok I will check this during the weekend, thanx

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Jj Dallinga estará eternamente agradecido.
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