Laptop power button issue?

I dropped my ThinkPad last night about 2 ft. The lights for F1, F4, and Fn are lit, and when I plug in my charger, the power button blinks a few times indicating that it is being charged. However, there is no response when I press the power button. Even when I hold it for more than 20 seconds, the lights don't turn off, indicating that the laptop is still on, but there is no screen display. I have removed the external battery, but I think the internal battery is still charged and keeping the laptop alive. Nothing looks out of place without unscrewing the laptop. What do you think is wrong? Any advice would be appreciated!

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Get a flashlight
"but there is no screen display."

Boot it, shine light at screen at angle, see if there's a dim image showing it booted properly. If so, then maybe the graphics chip is knocked loose. Many laptops lately have had problems with the onboard graphics chips coming loose from the motherboard. you can google for loose graphics on laptops and get more info about it. That may not be your problem.

Have you tried using an external monitor on the laptop when booting it?
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I tried

I tried to use an external monitor with no luck- it showed that there was no input. But that might be because of screen settings, which I can't change without being able to see the screen! I will try your flashlight advice though, thanks!

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The drop is your clue.

Laptops don't take drops well. At the top of this forum is the welcome so try the generic reset.
Remove power, battery, hold the power button for 60 seconds, release, slip in battery and apply power. Test.

If there is no display let's hear what model this is so I can see what parts run.

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Generic reset didn't work

Even after having left the removable battery off for a day and laptop unplugged, the aforementioned three lights are still on. No response from holding down power for 60s. It's a ThinkPad T440s.

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It's drop likely broke a few things.

You've completed the usual owner actions so now it's time to get a repair estimate. Be aware that some folk don't backup so we pull the HDD out and get their files out before it's sent to service.

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