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820-2784 imac white screen

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  • 820-2784 imac white screen

    this imac has a problem when it start with a white screen during 10min after boot on the system without problem but very slow.
    I start with the smallest configuration only mlb, lcd, and power supply, a keyboard (with alt key press) and it take 10min to switch the white screen with the selector boot.
    I try tomorow if i can start on asd but do you have any idea?
    thanks

  • #2
    This usually happens with a bad/failing internal HDD.

    You need to run ASD on this.

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    • #3
      Bad HDD connected or sensor failure. Also GPU issues are very common on these.

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      • #4
        I remove the HDD, i can't test the EFI i launch the efi after 20min i see the test search... but nothing more after 1h.
        i test with another board and i post the result in few hour.
        For the sensor how can i verify?

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        • #5
          it's a problem with the bluetooth board when i change it, the problem is solve.

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