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Try to clear any debris, use a little bit of silicone spray to free up the button, if that fails remove the cover and check the switch that's under the button. Sometimes the plastic button will break , wear out , that activates the switch underneath and doesn't "spring" back when pushed in, not resetting.
The WLAN switch on the Sony PlayStation Portable (PSP) is what turns the wireless capabilities of the console on and off. Unfortunately, it can easily come loose, causing your PSP to be stuck without connectivity. And if the switch is completely broken, you will need to purchase a new one and install it. Luckily, whether it is loose or broken, fixing the PSP WLAN switch requires only a small amount of effort, allowing you to reconnect to the Internet in very little time
I would remove the hinge / power button cover again and make sure the little pip that presses the button down it not broken, also check the little circuit board with the switch on to make sure it's not disconnected. Try switching on with the cover removed.
Seems that 1 something could have been knocked lose or 2 there is a break in the back of the screen that you can't see..It will have to be serviced either way....When it fell is the only way of knowing how much the prob could involve...hard fall from high or small fall from very low..crash to bump makes the diff of what the prob can be in all laptops...