820-2784 imac white screen

[raainxx]

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

 

[Gurmon]

This usually happens with a bad/failing internal HDD.

You need to run ASD on this.

 

[dukefawks]

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

 

[raainxx]

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?

 

[raainxx]

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