820-00239-09 - A1706 continues chime sound

2informaticos

Administrator
Staff member
You can get requested info here...
 
Hi,
After updating with a clean working image Scenario1 is not occurring at all, I mean not chiming or not going to loop.
I think it's directly going to Scenario 2.
Should I put back the old bios image or I should check something else with this bios image?
Scenario1- it goes to loop with a chime sound. When it is in the loop I can see there is the backlight.
Scenario 2 - When I try to start No backlight, Slowly CPU heat increasing.
 

2informaticos

Administrator
Staff member
Connect a macOS installer with LED Link; can be a SSD to USB adapter.
If LED flashes, then you have USB activity.
 

2informaticos

Administrator
Staff member
One LED is for power ; steady light as normal.
The other one MUST flash when boots; denotes data transfer/reading.
 
I can hear HDD running sound, sometimes the first LED is flashing, Maybe it's trying to boot... But not happening. I have just seen an apple logo for a moment. But not the boot loading bar.
 
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