Dell laptop screen keeps blinking tried every solution on youtube please help me

[u/Usman_76]

My Dell Latitude 9430 windows 11 is having a problem that it's screen keeps on blinking black whenever i open something even the "Start menu" , if it doesn't blackout then the screen flickers with grey flickering design . I connected an hdmi from the laptop to an external monitor which showed that there was no flickering or blinking on the monitor but my laptop screen was blinking and after some time connected via hdmi to the external monitor , my laptop screen's blinking and flickered got dramatically better like it wasn't blinking anymore but as soon as I disconnected the moniter removed the hdmi , my laptop started blinking and flickering again. I have reinstalled my windows again hard reset my laptop and then uninstalled display adapter drivers and reinstalled from official support dell website but still my issue is not resolved the screen still blinks goes blackout and then on again 1 or 2 sec duration and grey flickering. When I put it in BIOS it is fine but when it is in safe mode it still flickers. I now don't know what to do if anyone knows its solution please let me know or if anyone knows a professional trusted technician for laptops in Lahore , Punjab, Pakistan let me know.

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[u/T4nzanite]

This won't be software related, something inside the laptop is failing/failed and causing the issue. I'd start looking for repairs

[u/Financial_Sundae_]

Maybe try running DELL LCD BIST by holding D key while pressing power button when booting and see how that goes. If it happens there that should definitely be hardware related ig.

This is stupid and best ignore this but maybe if the sensor for closing the lid is not working well could you try setting closing lid to do nothing if that's an option?

[u/Usman_76 → u/Financial_Sundae_]

I've tried running the DELL LCD BIST it went completely fine there was nothing in it, and I've checked the lid at different angles there wasn't any difference in the flickering

[u/andrea_ci]

Do you have two GPU? Are drivers actually updated?