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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.
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.
i have the stairmaster 4000pt which was bought new in 2003. in 2007, i started experiencing the same problem, the right pedal would sometime slip and fall to the floor. i called the local fitness store and they came and replaced the hub assembly and that resolved the problem until now. The left pedal is now slipping.
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.