my MacBook Pro screen has gone dark but is working on alternate display

Hi,

Try to run Apple Diagnostics if it reports display or graphic processor error(VFD001 to VFD007).

Use Apple Diagnostics to test your Mac - Apple Support

geetika1013 wrote:

the MacBook screen has gone blank.

I want to check the status of hardware

Well this rules out GPU on the logic board—but does implicate the Display Assembly issue.

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"—

https://www.apple.com/retail/geniusbar/

Outside the USA

https://locate.apple.com/country

Check your coverage

https://support.apple.com/my-support

Learn how to get your Mac fixed and how much it will cost. https://support.apple.com/mac/repair/service

Get your Mac ready for service - Apple Support https://support.apple.com/en-us/HT209095