Hi drajitsh,
Greetings.
On a normal breakdown of the discrete VGA like due normal overheating that the integrated Intel chip would still allow normal display but as there would be other possible parts that get damaged with the power surge on capacitor and chip on the systemboard.
A solid power with black display on both internal and external screen shows failed power on self test as it falied to verify functional component such as graphic devices on the latter stage of POST.
Board level technician may be able to map out which but on multiple failed parts, a whole board replacement maybe a better option.
Try to check back with the tech if they would be able to perform the mapping else check options for motherboard replacement or how the tech would suggest.
Hope this help answer your query.
Regards
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