The power on switch will not work.

My Kindle Fire has been working for many years.

Try rebooting by holding down the power button, ignoring the "Shut down" prompt until it turns off. Then press and hold the power button until it starts to reboot. Does it?

First step would be to Reset Your Mac's SMC
The method for resetting your Mac's SMC depends on the type of Mac you have. All SMC reset instructions require shutting down your Mac first. If your Mac fails to shut down, try pressing and holding the power button until the Mac shuts down, which usually takes 10 seconds or so.

Mac portables with user-removable batteries (MacBook and most MacBook Pros):

1.Shut down your Mac.
2.Disconnect your Mac portable from its MagSafe connector.
3.Remove the battery.
4.Press and hold the power button for at least 5 seconds.
5.Release the power button.
6.Re-install the battery.
7.Reconnect the MagSafe connector.
8.Turn your Mac on.
Mac portables with non-user-removable batteries (MacBook Air and some late 2009 MacBook Pro models):

1.Shut down your Mac.
2.Connect the MagSafe power adapter to your Mac and to a power outlet.
3.On the built-in keyboard (this will not work from an external keyboard), simultaneously press and hold the left shift, control, and option keys while you press the power button. Release all keys at the same time.
4.Press the power button to start your Mac.

Mac desktops (Mac Pro, iMac, Mac mini):

1.Shut down your Mac.
2.Unplug your Mac's power cord.
3.Press and hold the Mac's power button for 15 seconds.
4.Release the power button.
5.Reconnect your Mac's power cord.
6.Wait five seconds.
7.Start your Mac by pressing the power button.

Alternative SMC reset for Mac Pro:

If you have a Mac Pro that isn't responding to the normal SMC reset as described above, you can force a manual SMC reset by using the SMC reset button located on the Mac Pro's motherboard.

1.Shut down your Mac.
2.Unplug the Mac's power cord.
3.Open the Mac Pro's side access panel.
4.Just below the Drive 4 sled and adjacent to the top PCI-e slot is a small button labeled SMC. Press and hold this button for 10 seconds.
5.Close the Mac Pro's side door.
6.Reconnect your Mac's power cord.
7.Wait five seconds.
8.Start your Mac by pressing the power button.
Now that you have reset the SMC on your Mac, it should be back to operating as you expect. If the SMC reset didn't fix your problems, you can try combining it with a PRAM reset. Although the PRAM works differently than the SMC, it can, depending on your Mac model, store a few bits of information that the SMC uses.

Unplug the power from the printer.
Press the # key and the 6 at the same time and hold them down
connect the power while continuing to hold down these keys
wait for a message about a semi-nvm reset or something like that to appear on the screen, and then release the buttons. If the unit shuts down while you are pressing the buttons, release them, and press power just long enough to turn the unit on.

If the printer does not react normally after this, post a reply here.

OK - had the same problem and got it finally figured out. Power the unit on the ignition key. Press and hold the source button so the unit shuts off. With the unit shut off press and hold the function button (the key is to hold the function button down) The clock, aux etc will show on the screen. Press (but do not hold) the function button and it will move to each function. When you get to the AUX press the ^ button and the will switch the AUX to "on". Once you know, like everything else, it's pretty easy.

Sharp updated the procedure for resetting the E1 code.

1. unplug unit
2. hold the Power button while plugging the unit back in
3. keep holding the Power button until the unit beeps
4. unplug unit again
5. plug it back in and it should be good

Here is the updated user manual

http://www.sharpusa.com/downloads/archives/product_manuals/air_man_AFS100FX_S120FX_S125FX_R100FX_R120FX.pdf

RTFM: Page 13:

"A demonstration of the display is shown if you have not set the
clock. You can reduce the power consumed in standby mode by turning the demonstration off.
While the unit is on:
Press and hold [–DEMO] until “NO DEMO” is
displayed.
Each time you press and hold the button:
NO DEMO (off) DEMO (on)

This is a 24-hour clock.
The example shows how to set the clock for 16:25 (4:25 p.m.).
1 Press [0/I] to turn the unit on.
2 Press [CLOCK/TIMER] to display “CLOCK”.
Each time you press the button:
CLOCK>>PLAY>>REC>>Original display
Within 5 seconds
Press [SET].
3 Press [TUNING (Up or Down)] to set the time.
The time display can be changed in one minute units by tapping
the buttons, and quickly by holding down the buttons.
Press [SET].
The time is set and the original display is restored."


Or under Troubleshooting Page 38:

"The display starts up even after the unit is turned off.

The demonstration feature (–DEMO) is on. Turn it off if it is not required."

If you need the manual go to
http://audio.manualsonline.com
register and get it for free.

During the system bios boot press and hold ALT + F10, that should start you into the system recovery options.

this could be due to the fault in the ac adapter,please try swapping another adapter if it works then you need to replace your adapter.

Hold the power button down. Keep it down until the unit powers off. Then press power to start the machine up, and as soon as you hear the starting chime (boooong) press Command+Option+P+R and keep them held down until you hear the startup sound 3 times. Then you can let go and it should start normally.

Power unit up from a completely off state. While it's starting up, hold the Mute and Menu buttons down the entire time. It will start up, then flash. As soon as you see the flash let go of the Mute and Menu buttons. Then, as soon as the lights come on around the unit quickly press and hold the Mute and Menu buttons again. The unit will boot into the Windows CE operating system. You then double click on My Device and delete HDD3 or, if you have a SD card in the slot, cut and paste the HDD3 to the SD card. Power the unit off holding the power button down for 7-10 seconds. Take out the SD card, if you have one in, then power up the unit. It should restart likes it's fresh from the factory. I will not be held responsible for any problems or bricked units! DO THIS AT YOUR OWN RISK!