When the power button is pressed, nothing happens.

Make sure the switch on the back of your power supply is set correctly and check for blown fuses.

How To Replace the iPhone 5 Power Button

Try this link:

https://www.support.xerox.com/support/workcentre-c2424/support/enus.html?operatingSystem=win10x64&fileLanguage=en

1. Press and hold the power button for 10 seconds. If nothing happens go to the next step.
2. Remove the battery of your laptop, then plug the power cord of your laptop directly, then press and hold the power button for 10 seconds. If nothing happens I would suggest to contact your manufacturer so that they can provide further assistance.

1. Power off
2. Remove the battery.
3. Put the battery to its place
4. Power on
5. If nothing happens
6. Replace the battery with charged one
7. Power on again

It should be work.

try to press and hold Fn and F8 - this is to toggle screen setting to ext and back to LCD on laptop. if nothing happens turn off computer by pressing power button, unplug the ac adapter, remove the battery. remvoe residual electricity from computer by pressing power button 10 times. just plug again the ac and leave the battery out. Pres and hold the letter D and while holding that press the power button once and release both of them. it will perform the built in self test on the lcd. if nothing happens, turn off computer. press anf hold Fn and while holding it press power button. it will perform diagnosis on computer. if still nothing happens need to repalce motherboard and LCD.

You need to replace the power supply, a fairly common problem.

we need more info on the phone itself, has it recently been subjected to abuse water or physical? if so maybe the battery itself is damages also try to bull the battery and leave it out for a full minute! if you can get power and just not on the screen then maybe the lcd digitizer is damaged and needs replaced! (please write back with any result or questions)

Turn power off and unplug power from computer.
Unplug printers,backup drives and speakers.
Open case and unplug power supply from the board.
plug power cord back in press the power button.
Of course nothing will happen.
unplug power cord again.
plug power supply back into the board.
plug power cord backup and press power switch.
If nothing happens unplug power cord again.
pull out your memory sticks and plug cord back in and press power button.
Of course not much will happen.
But really something is happening to your computer so continue.
Pull power cord and replace memory sticks.
replace power cord and press power switch.
Continue this pulling out pci cards one at a time until you find out what the problem might be.
Try different keyboards and mice too.
Good Luck

remove battery plug in power...see what happens ...nothing happens press and hold power button until you hear response(shut down)press power as usual to boot.if it doesnt work first time try a few times more remember to keep power button pressed to shut down.