My emachines4210 tower won't switch on no matter how long I hold the button in!

check you have not pulled the wire out the speaker jack ,pluse check you have put it back in the speaker slot.

Sounds like the drivers door lock switch is bad an as far as the auto start remote the contacts under the button get dirty and won't make contact, open the remote like changing the battery and you can probably get at the contact button, if it's a little carbon button they can be cleaned with a pencil eraser and then paper tower with a bit of rubbing alcohol, if it's an actual switch you can try spraying some contact cleaner into the switch. let it dry before you put the battery back in.

change master cylinder its bad internally

Make sure you Press and Hold the FN function key then hit the F2 key.

Maybe you don't have your wireless turned on. Look on both sides and in front for the Wireless Switch and turn it on.

Also once the wireless switch is turned on there are keystrokes that can toggle the wireless on or off. Normally you would Press and Hold the FN function key located at the lower left of the keyboard, then hit the correct F1 thru F12 key that toggles the wireless. The correct F1 thru F12 key to hit will have the wireless signal icon )))) on it. Or it might have the icon of a tower with the wireless signal icon )))). Normally the screen will display Wireless On or Wireless Off when you toggle the wireless.

Some laptops might have a wireless button instead of a wireless switch located above the keyboard or on the front or sides.

Did you turn the wireless switch on? Normally there is a switch either on the sides or the front of the laptop that you have to turn on. Sometimes it is a button at the top of the keyboard.

Also once the wireless switch is turned on there are keystrokes that can toggle the wireless on or off. Normally you would Press and Hold the FN function key located at the lower left of the keyboard, then hit the correct F1 thru F12 key that toggles the wireless. The correct F1 thru F12 key to hit will have the wireless signal icon )))) on it. Or it might have the icon of a tower with the wireless signal icon )))). Normally the screen will display Wireless On or Wireless Off when you toggle the wireless.

Get a new CD-Rom for you computer if you cannot use it, more than likely it is broken and need to be replaced. "Common with a lot of usage and people pushing the trays in without using the button, they wear over time like anything else. John

Turn the water on, hold trigger down and let water run thru the hose to prime the air out of the hose. If it still will not start check the spark plug and clean it or replace it. A bad spark plug will keep it from starting

Remove the power cord.
Locate the 120V / 240 V ac selector switch. (within 4 inch from the power inlet)
Move it back and forth few time.
Make use it's set to the correct voltage selection.
Reconnect power cord and power up.
===== This AC selector switch can get shifted and set to different position.

There is a small plasic acess cover (1/2" x1/2") on the base of the shifter. Pry it open and press the button. You should immediately be able to shift. The button is needed because the sensor on your brake pedal is broken (won't activate your brake lights either). Use the button on your shifter to get your car home or to the mechanic so you can get the brake switch fixed. Remember whern you drive you have no brake lights. -Mark

Hold the power button down on the actual tower of your computer. After about 10-15 seconds the computer will turn off and you can restart it. If that fails, as a last resort pull the power cable out of the tower. It isn't as damaging to the computer as most people think but should only be used if the computer won't turn off any other way.