A user reports they have no display on their laptop. Which of the following would be checked FIRST in order to narrow down the issue?

Swapping an entire laptop introduces too many variables and does not isolate which component is faulty, making it an inefficient first step.

Connecting an external monitor and toggling the output using the appropriate function key (Fn + display key) is a non-destructive, low-cost test that immediately determines whether the GPU and video output path are functional. If the external monitor shows output, the fault is isolated to the internal display panel or its cable connection, directing further diagnosis without unnecessary hardware replacement.

Power indicator LEDs only confirm the system receives power and does not validate motherboard functionality; ordering a replacement display before testing is premature and wastes resources.

Removing the display bezel is a physically invasive procedure that risks causing additional damage and should only be attempted after non-invasive tests have been exhausted.