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The power jack has a crack solder connection on the motherboard, the only way to fix this you must take the laptop apart in order to address the issue, this task requires someone with high specialty skills to pull it off and be able to use a soldering iron to fix the problem.
Unfortunately the only option you have is to have the LCD screen replaced, they are easily damaged in a fall and there nothing more than can be done. But the video cable from the motherboard to the screen might have been jarred loose and should be checked.
There are plenty of the screen inverters on Ebay, just search by the computer model number, not the inverter part number. They should be about 20 bucks with shipping. That is why your screen is dark, the inverter takes power from your power inverter and converts the DC power to AC for the LCD backlight. Yours sounds like is failing or failed.
From what you are describing, it sounds like the inverter board is failing. This board sits under the LCD screen and is responsible for taking the DC voltage from the battery and AC adapter and converting that voltage to high voltage AC power for the backlight lamp that sits inside the lcd screen. Without that high voltage the screen goes dark. Most inverters do not fail right away, there are voltage fall offs etc. Inverters are approx. 15-20 bucks on ebay, for most laptops, they can be changed out simply by removing the bezel around the screen, unplugging the two connectors on the inverter and changing it out. In most cases except Dell, the inverter is just sitting in there and is not held in by screws.
This could be a number of things that are causing the no start. The most common are a connection, device, or memory came loose during the fall, or the motherboard or a device was damaged. Start by checking the memory to see if it has been knocked out of its' slot, or slid out slightly. Then if you feel confident, take the machine apart and check all connections and devices. Devices are hard drive, cd drive, wireless card, etc... If you don't find any loose connections, obvious problems, or just don't feel confident in disassembling the machine, then I recommend you take it to a shop for a professional diagnosis.
On most models the hinges are a pressed in, pressure brake type hinges, and when the hinge start getting worn to the point of not holding the screen, then they can only be replaced in order to fix it. You can sometimes get away with replacing just one. On some models there are screws on the hinges that come loose that can cause this. The screws aren't for adjusting, they are basically just set screws. You won't know which is the problem until you take the covers off. Most likely you're going to have to replace the hinges. Try Ebay for the replacements.
It sounds like something came partially loose or was damaged. You can try that theory by taking it apart and looking. Or finding someone who can without charging you a lot. You'd be amazed what TV and video repair people can do. My guess is that it fell on its side, and a new LCD may be needed. But I agree that something may be done with it, as nothing is burnt or dead, as you said.