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Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.let me know the model number and how old is the laptop.
we have to diagnose the problem by troubleshooting the issue and then we can make out whats wrong in it. In case of hardware issue detected then you will have to either get it repaired of if any part found bad that can be replaced to get the unit back in working again.
In hardware cases i can only tell you what is bad and cannot make the bad part work on this chat session. I hope you understand.
sorry about the delay i had to restart my system. Let me know when you are ready.
you said when you plug in an external monitor do you get display on it?
Are you able to login fine to windows on the external tv/monitor?
Thanks for confirming now press the Fn key and hit the F5 key together at the same time on the keyboard together and let me know if you see anything on the laptop screen.
unplug the external monitor and then use a flashlight and check the laptop screen if you see any kind of display output.
let the laptop be on you must be on the windows screen then you unplug the external monitor and use a flash light to see if you see windows screen on the laptop.